An auger for the box sides of a truck or wagon bed utilizes an open-top hopper positioned on the tailgate of the vehicle, an elevator assembly having one end thereof within the hopper, and structure mounting the assembly for swinging movement relative to the hopper. A prime mover is operably joined with the assembly in all positions of swinging movement. The assembly is comprised of first and second operably interconnected sections, the uppermost of which is movable from its operating position to a collapsed position to reduce the effective vertical dimensions of the assembly during the transport of the vehicle.