Abstract: A trailer is disclosed having a forward section, a middle section, and a rearward section. The forward section is adapted to be attached to the fifth wheel of a tractor while the rearward section supports the trailer on a set of wheels. The middle section extending between the forward and rearward sections is positionable in at least two load-transporting positions at different heights above the ground. The forward and rearward sections each include fixed support elements and locking pins for securing the middle section to the fixed support elements at each of the load-transporting positions. Rollers are provided to guide the movement of the middle section between the load-transporting positions, at least some of the rollers being easily removed to permit front loading of the middle section. An air bag jack is included to move the front end of the middle between the lower-most load transporting position and a ground contacting front loading position.

Abstract: A trailer is disclosed having a forward section, a middle section, and a rearward section. The forward section is adapted to be attached to the fifth wheel of a tractor while the rearward section supports the trailer on a set of wheels. The middle section extending between the forward and rearward sections is positionable in at least two load-transporting positions at different heights above the ground. The forward and rearward sections each include fixed oblique support elements and locking pins for securing the middle section to the fixed oblique support elements at each of the load-transporting positions. Power actuators are provided for moving the middle section between the load-transporting positions.

Abstract: A trailer is disclosed having a forward section, a middle section, and a rearward section. The forward section is adapted to be attached to the fifth wheel of a tractor while the rearward section supports the trailer on a set of wheels. The middle section extending between the forward and rearward section is positionable in at least two load-transporting positions at different heights above the ground. The forward and rearward sections each include fixed oblique support elements and locking pins for securing the middle section to the fixed oblique support elements at each of the load-transporting positions. Fluid-actuated cylinders are provided for moving the middle section between the load-transporting positions.

Abstract: A trailer assembly comprises a main frame, main axles carrying laterally spaced wheels for supporting the main frame, a suspension system connecting the main axles to the main frame, a kingpin for coupling the main frame to a power unit, a secondary frame, one or more booster axles carrying wheels for supporting the secondary frame, a suspension system connecting the booster axle or axles to the secondary frame, and a booster axle connection system between the main frame and secondary frame for proportionately distributing weight or force between the main axles to the one or more booster axles. The booster axle connection system includes a lever arm extending forward from the secondary frame, a support arm extending rearward from the main frame, and a variably positionable pivot connection between the support arm and the lever arm providing a fulcrum for movement of the lever arm.

Abstract: An apparatus is disclosed for coupling a tractor to a trailer employing a detachable gooseneck type of connecting means, and has particular utility where loading and unloading is required without force binding of the mechanism. A trailer assembly is described that includes a trailer bed, a gooseneck having an end portion connected to the trailer bed, and a coupling mechanism having a tail member attached to the end portion of the gooseneck. The tail member is located centrally and rearwardly of the end portion of the gooseneck and defines an engaging bar. The rear section of the trailer bed is provided with ground-engaging wheels disposed thereon in supporting relationship, and the front section of the trailer bed has guide means thereat comprising side walls affixed to the guide means and sloping upwardly therefrom, with the guide means being complimentary to the tail member and engageable therewith.

Abstract: An apparatus for attaching a tractor with a trailer employing a fixed gooseneck with the gooseneck having a horizontally rearwardly inclined arm for connection with claw means and securement by a pair of dowels slidably mounted to project horizontally from the front end of the load carrying frame, with said dowels being moveable for engagement and disengagement with connecting stirrups on the tail member.

Abstract: A folding gooseneck trailer is disclosed having a positioning system for positioning the main bed of the trailer relative to the ground as well as the loading bed, or hitch platform, relative to the main bed and the ground. The loading bed of the trailer is pivotally mounted on the front end of the trailer main bed by a pair of spaced connecting links so that the loading bed can be raised and lowered relative to the main bed. The main bed has wheels at the rear end and, in the raised position, the loading bed holds the front end of the main bed off of the ground when the loading bed is mounted on the fifth wheel of a tractor, as by a king pin. A power mechanism is connected between the loading bed and a clevis plate attached to an elongated sliding element the lower portion of which terminates in a ground engaging foot. The sliding element is received in a channel in the main bed so that the sliding element is constrained to vertical movement in opposite longitudinal directions.