Abstract: A heavy duty tractor drawn lift deck trailer for transporting load holding pallet frame units each having a ground engaging support structure enabling it to be picked up for transport or dropped off for storage without need for additional equipment or personnel. The trailer features an over-center mechanical lock for the lift deck which will be power engaged as the lift deck is elevated into raised transport position and power released as the lift deck is permitted to descend to lowered loading position on the trailer support frame. The lock is connected between a point on the lift deck and a point on one of the trailer hinge panels and remains engaged when the lift deck is tilted for dumping.

Abstract: A tractor drawn lift bed highway trailer for transporting high tonnage loads over the highway, utilizing pallet frame units adapted to be picked up or dropped off quickly without the need for additional equipment or personnel. The trailer has a relatively light, strong main frame; a lift bed adapted to be elevated from lowered loading position forwardly and upwardly into engagement with the gooseneck for additional rigidity during transport; improved protection for the load and the tractor in event of an emergency stop; and improved cornering characteristics.

Abstract: A lift bed highway trailer adapted to be coupled by a gooseneck to a tractor to transport heavy loads through use of pallet frame units that can be quickly picked up and discharged at any point, the main frame of the trailer being shiftable between a lowered loading and unloading position and a raised transprot position. The trailer includes an improved power actuated locking mechanism in the gooseneck structure for positively securing the forward end of the main frame in the raised transport position.

Abstract: A lift bed highway trailer adapted to be coupled to a tractor to transport heavy loads through use of pallet frame units that can be quickly picked up and discharged at any point, including an improved power actuated mechanism in the trailer gooseneck structure and in the suspension subframe for positively locking the liftable bed in the raised transport position.

Abstract: A lift bed highway trailer having a wheeled suspension and adapted to be coupled to a tractor to transport heavy loads through use of pallet frame units that can be quickly picked up and discharged at any point, including a suspension subframe with guide means for maintaining the suspension in alignment with the main frame when the latter is in raised or lowered position, the subframe also including provision for withstanding the thrust of the main frame power lift means.