Abstract: A trailer including a longitudinally extending frame comprised of longitudinally extending frame members having rearward and forward ends. Each of the frame members has a first section modulus which is positioned forwardly of the rearward end thereof, at least a second section modulus which is positioned forwardly of the first section modulus, and a transition section modulus positioned therebetween. A running gear is longitudinally slidably mounted on the frame members and has running gear retainers mounted thereon which slidably embrace the lower end of the frame members. When the running gear is in its transport position, a spacer is provided between the running gear retainers and the frame members to prevent excessive play therebetween. The retainers are designed so that once the retainers move out of engagement with the spacers, there is sufficient play or gap between the retainers and the frame members to enable the running gear to move from the first section modulus to the second section modulus.

Abstract: A trailer comprising a wheeled frame including a main deck and an upper deck positioned thereon. The rearward end of the upper deck is pivotally interconnected to the forward end of the main deck by multiple arms which maintain the upper deck in a substantially horizontal position while the main deck is being pivoted with respect to the upper deck. A suspension system is slidably mounted on the wheeled frame and is slidably movable from a transport position to a tilt position forwardly therefrom to enable the main deck to be pivoted so that the rearward end of the main deck may be moved into ground engagement to enable equipment or the like to be mounted on the trailer.

Abstract: A trailer comprising a lower main deck and an upper deck positioned forwardly and upwardly of the main deck and including an upper deck ramp positioned at the forward end of the main deck which may be pivotally moved upwardly so that freight or equipment may be moved upwardly thereon from the main deck to the upper deck. Pivotally connected upper and lower scissor arms are provided at the opposite sides of the forward end of the upper deck ramp. A hydraulic cylinder is connected to each of the lower scissor arms adjacent the upper end thereof. The upper end of each of the upper scissor arms is connected to the forward end of the upper deck ramp with the lower end of the lower scissor arms being pivotally connected to the trailer frame. Extension of the hydraulic cylinders causes the scissor arms to spread apart to raise the upper deck ramp from a stored position to an inclined position.

Abstract: A main tail lock for a hydraulic tail trailer comprising a pair of spaced-apart locks which are pivotally secured to the frame of the tail and which are pivoted between locked and unlocked positions by a lock cylinder. When the locks are in their unlocked position, the tail cylinders for the tail may raise or lower the tail of the trailer. When the locks are in their locked position, the tail cylinders are prevented from retracting thereby preventing the lowering of the tail with respect to the main frame of the trailer.