Abstract: A method and system are described for controlled supplemental steering, by actuating a supplemental steering element, of a trailing implement connectable via a hitch to a pulling source, and wherein the trailing implement includes a pair of parallel wheels, a controller, a position sensing system that generates a hitch position history comprising a stored set of recent positions of the hitch point, and a steering angle actuator. The method carried out by the system includes maintaining a history of positions of the hitch, determining a target steering angle for the supplemental steering element, and actuating the steering angle actuator in accordance with the target steering angle. During the maintaining the history of positions of the hitch, the history of positions of the hitch is updated by performing a rotation operation and a translation operation on a set of coordinates of the history corresponding to previous hitch positions.

Abstract: An example trailer hitch is disclosed. The example trailer hitch includes a trailer hitch including a base to be coupled to a vehicle bed of a vehicle, a carriage slidably coupled to the base, the carriage to slide along rails of the base between a first position and a second position, and a head rotatably coupled to the carriage, the carriage to slide from the first position to the second position in response to rotation of the head.

Abstract: A fifth wheel hitch assembly is shown and described. The fifth wheel hitch system may comprise a jaw fixed about a pivot pin and a biasing member biasing the jaw to a closed position. The fifth wheel hitch assembly may also include a kingpin guide positioned opposite the jaw, where the kingpin guide is adapted to engage and retain a kingpin against the jaw.

Abstract: A fifth wheel hitch is adapted to affix to a vehicle having a vehicle-mounted ball that protrudes from towing vehicle surface. The hitch has a frame with a sleeve portion that is fixed with respect to the frame and a receiver is telescopingly received inside the sleeve portion. The receiver is selectively affixed to the frame with a pin that extends through the receiver and sleeve portion. A ball cage affixes to the vehicle-mounted ball using pins that extend through vertical walls in the cage. The cage includes a threaded fastener that extends outwardly. The frame has an elongate aperture that receives the threaded fastener to secure the ball cage with a nut into a cage pocket. An optional lock overlays the nut with a nut locking aperture that prevents the nut from rotating.

Abstract: A fifth wheel hitch is shown and described. The fifth wheel hitch may include a base frame configured to be secured to a load bed of a towing vehicle, a trolley operatively engaged with the base frame, the trolley adapted to move along the base frame between first and second positions, and a cam member attached with the base frame, the cam member having a cam path. The fifth wheel hitch may also include a cam follower coupled with the trolley, the cam follower operatively engaged with the cam path, and a fifth wheel head pivotally coupled with the trolley, where the trolley is moved between the first and second positions in response to pivoting of the fifth wheel head.

Abstract: A fifth-wheel hitch system is described including: (a) a framework having an upright support; wherein the framework is adapted to be secured to a towing vehicle; (b) a support plate member secured to the top of the support member; wherein the plate member preferably includes a raised central portion and lower side portions; (c) a yoke member attached to the support plate member with fasteners which allow the yoke to be tilted away from the raised central portion of the plate member and then biased back to a central position; and (d) a receiver member attached to the yoke member for receiving and releasably connecting to the king pin of a trailer to be towed.

Abstract: A sliding fifth wheel hitch assembly includes a longitudinal rail having a substantially vertical side member, a first end portion, and a second end portion. At least one carriage bracket is slidably engaged with the longitudinal rail. The carriage bracket is adapted to support a hitch plate. An engagement assembly is coupled with the carriage bracket for releasably engaging the longitudinal rail along a length of the longitudinal rail between the first and second end portions. At least one slide stop laterally extends from the substantially vertical side member of the longitudinal rail proximate at least a select one of the first end portion and the second end portion. The slide stop is positioned to abut the carriage bracket, thereby limiting a sliding motion of the hitch plate with respect to the longitudinal rail.

Abstract: Sliding hitch assemblies including a rail assembly, a support assembly disposed upon and configured to translate between at least two positions along the rail assembly, a hitch head assembly mounted on the support assembly, and a translation lock mechanism including a locking assembly coupled to the support assembly and configured to selectively lock the support assembly in one or more of the at least two positions on the rail assembly, and an actuating assembly configured to actuate the locking assembly, where the actuating assembly is operably coupled to the locking body by an anti-binding assembly. The support assembly may be disposed upon the rail assembly via a glide block that includes a composite material.

Abstract: In an example embodiment, a system for providing a height change command for an implement, comprises a height control module configured to interact with a computer, and configured to receive topographical data, provide a virtual field map based on said topographical data, provide a forward view polygon for an implement based on said virtual field map, and provide a height change command for said implement based on said forward view polygon and an implement control unit configured to receive said height change command and control movement of said implement.

Abstract: A fifth wheel hitch support assembly includes a support bracket adapted to pivotally support a fifth wheel hitch plate, a mounting member adapted to be coupled to a vehicle frame rail to create a gap therebetween and above the frame rail, wherein the gap extends longitudinally along the mounting member, and wherein the mounting member includes a plurality of irregularities spaced longitudinally along the length thereof, and an engagement assembly operably coupled to the support bracket wherein the engagement assembly is operable between an engaged position locking the support bracket with respect to the mounting member at a select position along the length of the mounting member, and a disengaged position wherein the engagement assembly does not engage the plurality of irregularities, thereby allowing the support bracket to be slidably repositioned with respect to the support bracket.

Abstract: Examples of sliding hitch assemblies, and locking mechanisms therefor are disclosed. Sliding hitch assemblies include a pair of slide rails slidably supporting a fifth wheel. Each of the slide rails in turn includes a driving position locking pin that selectively locks the fifth wheel in a driving position, and a maneuvering position locking pin that selectively locks the fifth wheel in a maneuvering position. A cam member is slidably mounted inside each slide rail, and includes a first cam surface that unlocks the driving position locking pin when the cam member is in a first position, and a second cam surface that unlocks the maneuvering position locking pin when the cam member is in a second position. The fifth wheel is mounted on a pair of downwardly facing U-shaped members slidably supported on the slide rails, and a wear block is interposed each slide rail and a corresponding one of the U-shaped members.

Abstract: A fifth wheel slide assembly secondary lock includes an elongated cam member supported by a spindle extending upward from a sliding pedestal. A pair of linkage bars are pivotally coupled by one end to opposing ends of the cam member, the other ends of the bars being coupled to wedges operable for selectively engaging slide rails mounted to a vehicle frame in order to maintain a longitudinal position of said pedestal. The pedestal includes at least one stop extending upward from the pedestal at a height that extends above an arc defined by the rotation of the cam.

Abstract: A slider for a fifth wheel is arranged on a towing vehicle, comprising a substructure with at least two guide rails aligned in the direction of travel, a displaceable slide carrying the fifth wheel and acting upon the guide rails, and a motor-driven drive unit. A slider is provided which allows the gap width between the towing vehicle and the trailer being adapted to the respective driving situation during travel. For this purpose, the slider is characterized in that the motor-driven drive unit is configured from a hydraulic cylinder connected to a hydraulic circuit.

Abstract: An automatically adjustable fifth wheel assembly for a vehicle and trailer combination that adjusts the position of the trailer relative to the vehicle is disclosed.

Abstract: A fifth wheel glider hitch is disclosed having a pair of sliding rails that support a fifth wheel assembly, the fifth wheel assembly sliding on the rails over first and second brackets that include a locking hole. The sliding rails each have apertures defining a forward position and a rear position, and the glider includes handle with a locking mechanism that traps the assembly in a forward or aft position.

Abstract: A method and apparatus for providing a displaceable fifth-wheel hitch assembly configured to be mounted in a bed of a truck. The displaceable fifth-wheel hitch assembly includes a platform track, a displaceable platform, and an adjustment assembly. The platform track defines a track space therein and is configured to be mounted in the bed of the truck. The displaceable platform is configured to be positioned in the track space and includes a fifth-wheel hitch coupled thereto. The adjustment assembly includes a means for displacing the platform and a means for locking the platform in place with respect to the platform track and truck. The means for locking the platform includes a locking pin that is spring biased into holes in the platform track. The means for displacing the platform includes an adjustment rod and bracket to displace the locking pin from its locking position.

Abstract: A fifth wheel hitch support assembly includes a support bracket adapted to pivotally support a fifth wheel hitch plate, a mounting member adapted to be coupled to a vehicle frame rail to create a gap therebetween and above the frame rail, wherein the gap extends longitudinally along the mounting member, and wherein the mounting member includes a plurality of irregularities spaced longitudinally along the length thereof, and an engagement assembly operably coupled to the support bracket wherein the engagement assembly is operable between an engaged position locking the support bracket with respect to the mounting member at a select position along the length of the mounting member, and a disengaged position wherein the engagement assembly does not engage the plurality of irregularities, thereby allowing the support bracket to be slidably repositioned with respect to the support bracket.

Abstract: A highway tractor (12) has a fifth wheel (28) to which a trailer (14) that is to be towed by the tractor can be coupled. A positioning system sets fore-aft position of the fifth wheel on the tractor. The positioning system (FIG. 2; FIG. 3) has a positioning mechanism for moving the fifth wheel fore and aft on the tractor and a controller for processing certain data that is used to cause the positioning mechanism to move the fifth wheel to a fore-aft target position on the tractor.

Abstract: A truck tractor and removable body unit system selectively configurable as a tractor and freight box or an articulated truck-trailer combination includes a truck tractor having a frame supporting a drive axle and a steer axle with a fifth wheel mounted on the frame, and a body unit having a body mounted on a frame, the frame supported by a wheeled axle and having a king pin for releasably engaging the fifth wheel on the truck tractor. The body unit includes a coupling mechanism for releasably coupling the truck tractor frame to constrain lateral movement between the truck tractor and the body unit while allowing relative vertical pivoting movement between the truck tractor and body unit about the king pin and fifth wheel. An adjustable spring mounted to one of the truck tractor and body unit to act between the truck tractor frame and the body unit frame to adjust a loading between the truck tractor frame and body unit.

Abstract: The invention relates to a supporting traverse for reinforcing a vehicle frame, comprising a cross-member with a fastening region, which is integrally formed thereon on the end and can be connected to the vehicle frame, and bearing blocks acting between the fastening regions on the cross-member. The aim of the invention is to refine a supporting strut with which the risk of the bearing block breaking away from the cross-member due to wear is considerably reduced. According to the invention, said aim is achieved by a supporting traverse, wherein the bearing blocks and the cross-member are connected to each other in a non-detachable way.

Abstract: A hitch for coupling a trailer to a towing vehicle includes a hitch assembly and a base assembly. The hitch assembly pivots between an aligned position and a turning position as the towing vehicle turns. A bearing assembly rides between the hitch assembly and the base assembly. The bearing assembly guides the hitch assembly between the turning and aligned positions. The base assembly has an anchor assembly which prevents the hitch assembly from sliding fore or aft when in the aligned position.

Abstract: A pin box assembly is provided for a trailer. The pin box assembly includes a first section having a trailer attachment point, a second section carrying a king pin and a pivot connecting the first and second sections together. In addition the pin box assembly includes a shock absorber having a first end connected to the first section and a second end connected to the second sections. Still further, the pin box assembly includes an air spring connected between the first and second sections.

Abstract: A tractor dolly assembly is disclosed for use with a semi tractor or other vehicle to be towed in either a forward or reverse direction. The tractor dolly assembly is configured to be coupled to the rear frame of a semi tractor or other vehicle and lift the rear wheels off the ground for towing. In a forward tow direction, a conventional tow truck with a hydraulically operated boom for lifting the front of the semi tractor off the ground. In a reverse direction, virtually any truck with a pintle for connection to a tow bar can be used for towing the disabled vehicle. In accordance with an important feature of the invention, since the tractor dolly assembly is configured to be secured to the frame of a disabled vehicle, the dolly can be used with vehicles having a fifth wheel assembly and vehicles without a fifth wheel assembly.

Abstract: An articulated selective adjustment apparatus carried within the pedestal of a fifth wheel assembly comprises a mounting plate pivotally connected to a plunger arm configured for selective extension and withdrawal from the pedestal, and having ends to which are pivotally connected first and second prongs having interior ends disposed toward the pedestal that are pivotally connected to the mounting plate ends.

Abstract: A method and apparatus for providing a displaceable fifth-wheel hitch assembly configured to be mounted in a bed of a truck. The displaceable fifth-wheel hitch assembly includes a platform track, a displaceable platform, and an adjustment assembly. The platform track defines a track space therein and is configured to be mounted in the bed of the truck. The displaceable platform is configured to be positioned in the track space and includes a fifth-wheel hitch coupled thereto. The adjustment assembly includes a means for displacing the platform and a means for locking the platform in place with respect to the platform track and truck. The means for locking the platform includes a locking pin that is spring biased into holes in the platform track. The means for displacing the platform includes an adjustment rod and bracket to displace the locking pin from its locking position.

Abstract: The present invention is directed to a trailer hitch isolation assembly that attaches to the tongue of a fifth wheel trailer and that provides a moveable connection between a tow vehicle and the trailer. The hitch assembly includes a floating hitch attachment member such as a king pin, which is adapted to be attached to a tow vehicle. The hitch isolation assembly allows the hitch attachment member to move at least vertically relative to the tow vehicle to which the hitch assembly is connected. One or more air springs connect the floating hitch attachment to the frame of the trailer. These air springs permit relative movement between the attachment support member and the frame.

Abstract: A fifth wheel hitch for towing a trailer behind a motor vehicle is adjustable between a forward position and a rearward position. The fifth wheel hitch includes a base assembly for mounting to the motor vehicle, head assembly for engaging the trailer and at least one pivoting arm coupled between the base assembly and the head assembly. The head assembly moves in an arcuate path between the forward position and the rearward position as the pivoting arm articulates relative to the base assembly. Once positioned in the forward or rearward position, the head assembly is locked relative to the base assembly so as to prevent further movement.

Abstract: A fifth wheel assembly for coupling a trailer to a truck tractor is provided and includes a fifth wheel and a supporting structure for supporting the fifth wheel on the rear part of the tractor truck. The supporting structure includes a sliding arrangement enabling the fifth wheel to be repositioned between different positions. A number of sensors are positioned on the supporting structure and on the fifth wheel and are included in a control system for predetermined information and control of operating conditions.

Abstract: A kingpin assembly comprises a housing having a recess located therein, a collar member operably coupled to the housing, and an integral single-piece kingpin having at least a portion located within the recess of the housing, wherein the housing and collar cooperate to rotationally secure the kingpin within the recess of the housing, and wherein the kingpin provides a sole rotational support for the kingpin with respect to the housing and the collar.

Abstract: A sliding fifth wheel assembly for slidably connecting a trailer hitch to a vehicle, comprising at least one rail connectable to the vehicle and a platform connectable to the trailer hitch. The platform is slidably mounted to the rail for movement between a forward position and a rearward position. At least one stop bar is connected to the platform, and at least one locking bar is pivotally mounted to the rail for selective engagement with the stop bar to retain the platform in either the forward position or the rearward position. The locking bar may be selectively engaged by at least one actuator.

Abstract: An extension coupling for interconnecting a trailer to a tow hitch carried on a tow vehicle includes a pin box assembly having a first end and a second end. The first end is pivotally connected to the trailer. A king pin is connected to the second end. The pin box assembly includes a locking wedge that engages the tow hitch to strictly limit pivoting movement of the pin box assembly relative to the tow hitch.

Abstract: A bearing guide for a hitch allows lateral movement of the hitch. The bearing guide is elevated relative to the bearing surface. Two trucks roll on wheels each about their own elevated guide for fore-and-aft rolling of the hitch point. The bearing guide also provides a keyway which receives a locking key. The locking key is supported on both sides of the keyway by a plunger control rod, and can be unlocked by pulling and rotating a handle. When the towing vehicle is driven to relocate the hitch point, the locking key reengages itself into a different keyway on the bearing guide.

Abstract: A pin box assembly is provided for a trailer. The pin box assembly includes a first section having a trailer attachment point, a second section carrying a king pin and a pivot connecting the first and second sections together. In addition the pin box assembly includes a shock absorber having a first end connected to the first section and a second end connected to the second section. Still further, the pin box assembly includes an air spring connected between the first and second sections.

Abstract: A hitch for coupling a trailer to a towing vehicle includes a first coupling means for coupling with the trailer at a pivot point and a second coupling means for coupling with the trailer at a towing point. A displacing means is responsive to pivoting of the trailer with respect to the towing vehicle to move the hitch and the pivot point on the towing vehicle toward the rear of the vehicle when turning is effected and to move the hitch and the pivot point on the towing vehicle just forward of the vehicle's rear axle during normal longitudinal movement of the towing vehicle and trailer. The second coupling means is capable of transferring at least the majority of the towing force between the towing vehicle and the trailer.

Abstract: Fifth wheel hitch assemblies and fifth wheel hitch adaptors for dampening differential motion between a fifth wheel trailer and a tow vehicle. An upper assembly is formed as a box with an open bottom, and a lower assembly has front, rear, and side plates that extend into the open bottom of the upper assembly. Slide plates are disposed on the front and sides of the upper assembly facing at the front and side plates of the lower assembly. An additional slide plate is disposed on the rear plate of the lower assembly and faces the rear of the upper assembly. The lower assembly and upper assembly are attached to one another by an airspring and at least two diagonally opposed shock absorbers mounted therebetween. A locking mechanism may be included to prevent overextension between the upper assembly and lower assembly when not in use.

Abstract: This fifth wheel coupler release apparatus for adding to a fifth wheel hitch. The fifth wheel coupler provides a manner of releasing the coupling mechanism of a fifth wheel from a more accessible position and in a manner that can overcome any resistance through a lever arm type assembly.

Abstract: The present invention relates to a steering device for facilitating the steering of an implement towed by a work vehicle. The towed implement, for example, a farm implement such as a seeding device, comprises a main frame having front and rear ends and at least one steerable surface engaging wheel attached to the frame. The steering device comprising a sensor means mounted on the main frame of the towed implement for sensing a misalignment of the towed implement and the work vehicle and producing a signal corresponding to the misalignment. The steering device further comprises a steering means associated with the steerable wheel for receiving the signal produced by the sensor means and for effecting movement of the steerable wheel in response to the signal until the towed implement and the work vehicle are once again realigned.

Abstract: A towing hitch assembly adapted to be connected to a towing unit and a towed unit is disclosed. In general, the towing hitch assembly comprises a support connector releasably attachable to a towing hitch of a towing vehicle and pivotally connected to at least two arms, a support structure adapted to be connected to the unit to be towed and pivotally connected to the arms, and at least two arms pivotally connected on one end to the support connector and pivotally connected on the other end to the support structure. The towing hitch assembly reduces jarring and other undesirable movement between the towing unit and the towed unit during operation.

Abstract: A sliding hitch for receiving a trailer includes a rectangular base member having opposed end portions attachable to a bed of a truck. The sliding hitch further includes a plurality of stationary members aligned with each other. One of the plurality of stationary members has a groove formed therein extending substantially parallel to a longitudinal axis. A plurality of helical spring members are disposed adjacent the opposed end portions of the base member respectively. The sliding hitch further includes a hitch member having a lower portion and an upper portion having a substantially spherical shape integral with the lower portion and extending upwardly therefrom. The plurality of spring members allow the hitch member to slide forwardly and rearwardly to thereby reduce forces exerted on a truck and a trailer during operating conditions.

Abstract: The present invention relates to a base rail kit for a motor vehicle. The base rail kit includes a base rail including first and second mounting flanges, a first bracket including a first base rail support platform and a first mounting lug, a second bracket including a second base rail support platform and a second mounting lug, first and second spacers and first and second fasteners.

Abstract: A shock absorber for fifth wheel hitches for pickup trucks has a bushing embedded in memory polyurethane elastomer confined within a metal frame. The shock absorbers are mounted by brackets on the fifth wheel hitch support frame. The bushings receive pivot pins terminal to a cross beam mounting the couple assembly of the hitch. Both bushing and shock absorber frame have projections extending into the elastomer for better engagement. The projections can be studs or planar lugs. When the projections are loops of wire welded to the bushing and frame, the elastomer flows into the loops providing better engagement.

Abstract: A fifth wheel suspension assembly for damping movement between a towed vehicle and a towing vehicle is provided. The suspension assembly includes two rods on which a fifth wheel base is mounted. The fifth wheel base moves along the two rods in a direction of the longitudinal axis of the towing vehicle. The fifth wheel base defines two bores through which the rods extend. These bores also define fluid chambers disposed about the rods. Pistons are disposed about the rods within the fluid chambers and serve to dampen oscillatory movements of the towed vehicle relative to the towing vehicle. Springs disposed about the rods on either side of the base further dampen pitch motions imparted to the towing vehicle by the towed vehicle.

Abstract: An adjustable fifth wheel hitch includes a support frame having base rails that are secured to the frame of a vehicle and a pair of spaced guide rails that bridge between the base rails. The fifth wheel hitch also includes a head assembly having a jaw assembly for engaging a king pin on a trailer. A head support includes a pair of uprights having sets of rollers for mounting the head assembly for relative fore-and-aft sliding movement along the guide rails between the towing position and a maneuvering position. A releasable lock secures the head assembly in either selected position.

Abstract: The invention relates to a sliding device for a fifth wheel. The aim of the invention is to reduce the overall weight of the system consisting of vehicle frame/slide system and also to simplify its assembly. To this end, the base frame is provided with two longitudinally extending angular profiles that are linked with each other by means of two detachable and slidably mounted tie-bars. Every angular profile comprises retaining means that interact with second retaining means of the upper part in such a manner that the upper part can be displaced relative to the base frame in the longitudinal and the transverse direction. The invention device does not require an auxiliary frame that is conventionally used.

Abstract: A glider fifth wheel attachment assembly includes a support frame including a pair of spaced guide rails and a pair of upright assemblies attached to the guide rails. Each upright assembly includes a lower sleeve portion for receiving a respective guide rail, an intermediate housing portion vertically above the sleeve portion, and an upper mounting portion vertically above the housing portion. A head assembly may be adjustably mounted between respective housing portions of the upright assemblies. At least one roller is positioned within each housing portion of the upright assemblies such that the at least one roller contacts an upper surface of an upper guide rail. In addition, the glider fifth wheel attachment assembly includes a latching assembly for releasably locking the glider fifth wheel attachment assembly between a first and a second position.

Abstract: A combination hitch for allowing a towed vehicle to be fastened to a tow vehicle. The combination hitch includes a base for being attached to the bed of the tow vehicle, the base including a ball hitch member located substantially over the centerline of the rear axle of the tow vehicle. The combination hitch also includes a superstructure movable between a first position attached to the base and second position attached to the base. The superstructure has a pin box hitch member located substantially directly over the ball hitch member and the centerline of the rear axle of the tow vehicle when the superstructure is in the first position and not located substantially directly over the ball hitch member and the centerline of the rear axle of the tow vehicle when the superstructure is in the second position.

Abstract: A hitch apparatus for removably coupling a trailer to a tow vehicle provides fore and aft cushioning, vertical cushioning and roll accommodation. When it is mounted on the tow vehicle, a mounting assembly is situate in the truck bed of the tow vehicle and includes a pair of rails pivotally coupled at a first end with the truck bed. A carriage is mounted on the rails by means of a pair of rail guides, each of which slidably receives a corresponding one of the rails, and is thus slidable in directions fore and aft on the tow vehicle. A shock absorber is pivotally, diagonally coupled between the truck bed, at one end, and the lower surface of the carriage at the other end. A cradle is pivotally mounted for side-to-side rocking within the carriage. A hitch adapted to receive the trailer is mounted to the cradle. A first plate is mounted to the second ends of the rails. An air bag is mounted to the truck bed directly underneath the first plate to provide vertical cushioning.

Abstract: A glider fifth wheel attachment assembly includes a support frame including a pair of spaced guide rails and a pair of upright assemblies attached to the guide rails. Each upright assembly includes a lower sleeve portion for receiving a respective guide rail, an intermediate housing portion vertically above the sleeve portion, and an upper mounting portion vertically above the housing portion. A head assembly may be adjustably mounted between respective housing portions of the upright assemblies. At least one roller is positioned within each housing portion of the upright assemblies such that the at least one roller contacts an upper surface of an upper guide rail. In addition, the glider fifth wheel attachment assembly includes a latching assembly for releasably locking the glider fifth wheel attachment assembly between a first and a second position.

Abstract: A glider fifth wheel attachment assembly includes a support frame including a pair of spaced guide rails and a pair of upright assemblies attached to the guide rails. Each upright assembly includes a lower sleeve portion for receiving a respective guide rail, an intermediate housing portion vertically above the sleeve portion, and an upper mounting portion vertically above the housing portion. A head assembly may be adjustably mounted between respective housing portions of the upright assemblies. At least one roller is positioned within each housing portion of the upright assemblies such that the at least one roller contacts an upper surface of an upper guide rail. In addition, the glider fifth wheel attachment assembly includes a latching assembly for releasably locking the glider fifth wheel attachment assembly between a first and a second position.

Abstract: A glider fifth wheel automatic adjustment assembly includes a support frame including a pair of spaced guide rails and a pair of upright assemblies attached to the guide rails. Each upright assembly includes a lower sleeve portion for receiving a respective guide rail, an intermediate housing portion vertically above the sleeve portion, and an upper mounting portion vertically above the housing portion. A head assembly may be adjustably mounted between respective housing portions of the upright assemblies. At least one roller is positioned within each housing portion of the upright assemblies such that the at least one roller contacts an upper surface of an upper guide rail. In addition, the glider fifth wheel attachment assembly includes a latching assembly for releasably locking the glider fifth wheel attachment assembly between a first and a second position.