A dump truck body including a receptacle defined by a floor and, extending from the floor, first and second side walls on opposite sides of the floor, and a front wall and a tailgate, located on opposite sides of the floor and extending between the side walls. The floor of the dump truck body includes at least one longitudinal support structure which substantially extends from the front wall to the tailgate, a substantially planar support plate attached to the at least one longitudinal support structure, and at least one floor section attached to the at least one longitudinal support structure, without a plurality of longitudinally spaced, transverse supports attached to the at least one floor section, the at least one longitudinal support structure, and the substantially planar support plate. In addition, a conveyor system is attached to the at least one longitudinal support structure, the floor having at least one opening in alignment with the conveyor system.