Abstract: A horizontal extension panel is provided for disposition immediately outwardly of the free end of the open tailgate of a pickup truck with the extension panel structure substantially coextensive with the tailgate and the opposing marginal edges of the extension panel structure and tailgate disposed in abutted relation. A pair of support arms extend across the upper surface of the extension panel structure along the opposite side marginal edges thereof and the support arms extend over the opposite side marginal edges of the tailgate and include terminal ends which overlap the opposite side marginal portions of the rear end of the floor of the pickup truck. A pair of rearwardly and downwardly inclined brace arms or members are secured at their rear lower ends to the outer portions of the support arms secured to the extension panel structure and the upper forward ends of the brace arms are secured to the upper rear marginal edge portions of the side walls of the pickup truck.