Abstract: Apparatus which enhances the load carrying capacity of a dump truck without interfering with dumping of the dump bed. A rigid frame which is added to the back end of the truck includes a beam carrying an axle and a pair of wheels. A hydraulic cylinder pivots the beam between a load bearings position in which the wheels travel on the roadway to bear part of the dump bed load and a raised position in which the beam extends vertically between a pair of side by side tail gates. A hinged door operates in the space between the two tail gates to prevent spillage of the load through the space while accommodating extension of the beam through the space when the dump bed is raised to dump its load. A diverter in the dump bed deflects material away from the space and toward the tail gate openings.