Abstract: A hopper gate mechanism for opening and closing the bottom opening of a hopper containing vehicle. The mechanism typically includes two doors hinged along the longitudinal axis of the associated vehicle and fluid pressure actuated motor means for selectively actuating latching members normally employed to maintain the doors in a closed position.

Abstract: An improved dual purpose trailer body for a wheeled vehicle convertible to one position for handling freight of a bulk nature such as coils of steel or paper, panels of drywall construction material, and the like, and to another position for handling comminuted material such as dolomite, grain, and the like. The trailer body having normally horizontally disposed load supporting floor sections which are movably associated with the trailer body and positionable to a generally vertically disposed attitude to produce a bin wall structure forming a zone communicating with a hopper therebelow for receiving and maintaining comminuted material.