Abstract: A load carrying body for a truck or truck trailer, including a flat rigid bottom panel assembly and two flat rigid side panel assemblies respectively secured along their bottom edges to the respective side edges of the bottom panel assembly, all enclosed across their rear ends by a selectively latched or unlatched pivotally supported load retaining door assembly.A load manipulating door assembly, initially positioned to enclose the front end of the load carrying body, having a bottom and two side edge portions all supporting uninterrupted elongate flexible wiper strips respectively continuously maintained in uninterrupted sliding engagement with the inner surfaces of the load carrying body.