Abstract: An extensible arm is located in the bed of a truck or a trailer and is selectively operable to assist in the stacking or unstacking and unloading of a stacked palletized load from the elevated bed to the ground level using a load lift on the truck or trailer and a pallet jack. The stacked load is moved from the bed onto the load lift with a pallet jack or other load transporter, and the load lift is lowered to a position where the extensible arm can be extended below the pallet of an upper load portion of the stacked load. After the arm is extended, the load lift is lowered to the ground leaving the upper load portion on the extended arm and moving the lower load portion of the stacked load to the ground, thereby unstacking the load. Thereafter, the lift is raised to engage the upper load portion, the arm is retracted, and the lift is lowered to lower the upper load portion to the ground.

Abstract: A cargo platform system particularly structured for use with, e.g., a truck body's cargo opening. The system includes a mast assembly with a mast guide and a mast movably supported by the guide, the mast assembly being fixed to the truck body. A cargo platform is pivotally connected to the mast, the platform being swingable relative to the mast between a horizontal elevator position and a vertical storage position.

Abstract: A cargo platform system particularly structured for use with, e.g., a truck body's cargo opening. The system includes a mast asembly with a mast guide and a mast movably supported by the guide, the mast assembly being fixed to one vertical side edge of the cargo opening. A cargo platform is pivotally connected to the mast, the platform being swingable relative to the mast between a horizontal elevator position and a vertical storage position. A latch system partially carried by the mast guide and partially carried by the mast allows the mast and mast guide to be latched together so that substantially no relative movement therebetween is possible in a first latched position when the platform is in its storage position and located entirely below the truck body's cargo floor and also in a second latch position when the platform is in the storage position and located substantially above the cargo floor.