Abstract: A composite trailer tow bar has a bifurcated rearward portion terminating in parallel pointed pins which fit into laterally-spaced holes in a vertically-movable adjustable plate attached to an elongated angle bracket secured as by welding to the converging trailer frame side members at the forward end of the trailer frame. Mounted on a support plate secured to the forward end of the trailer frame is a vertical trailer jack which extends downward between the bifurcated portions of the tow bar. Secured to the top and bottom of the latter are gusset plates, the upper one of which carries a rearward coupling ball adapted to receive a coupling socket on the forward end of the trailer frame. The forward portion of the tow bar terminates in a forward coupling socket which is adapted to engage a forward coupling ball, the center of which is in substantially the same horizontal plane as the axis of the rear axle housing of the towing vehicle and is positioned immediately behind the differential housing thereof.