Abstract: Generally horizontally disposed bracing trusses (44, 46) are interconnected between the bottoms of the longitudinal drive beams (70, 72, 74) and the bottoms of the associated transverse drive beams (100, 102, 104), within a reciprocating floor conveyor. This and other reinforcement particularly adapts the system for use in a stationary installation having a relatively wide floor. Trucks (RV) equipped with reciprocating floor conveyors are backed into a receiving house (H) and the conveyors are used for unloading bulk material (B) from the trucks (RV) into the receiving house (H). The bulk material (B) is conveyed from the receiving house (H) up to an elevated inlet (16) at one end of an elongated enclosure (E). The enclosure (E) includes a reciprocating floor conveyor (24) at its bottom and an elevated screw conveyor (36) at its top. The reciprocating conveyor (24) is operated to move bulk material out from the enclosure (E) at a controlled rate.