Patent ID: 7631881

Claim:
A towable wheeled vehicle having a frame with two spaced apart parallel side beams and a steering axle, said towable wheeled vehicle releasably attachable to a towing vehicle having a power source operatively communicating with back up lights energized when the towing vehicle moves rearwardly, the towable wheeled vehicle comprising in combination: a first airbag lever arm and a second airbag lever arm structurally attached to the steering axle extending radially therefrom and angularly to each another; a first airbag communicating between the first airbag lever arm and the frame, and a second airbag communicating between the second airbag lever arm and the frame; an air pump electrically communicating with the power source; a pneumatic switch communicating with the air pump, with the first airbag and with the second airbag; an electric circuit operatively communicating with the back up lights and with the pneumatic switch, wherein the pneumatic switch directs pressurized air to the first airbag when the back up lights are not energized, and wherein the pneumatic switch directs pressurized air to the second airbag when the back up lights are energized wherein inflation of the first airbag rotates the steering axle axially in axle sleeves providing positive caster and inflation of the second airbag rotates the steering axle axially in the axle sleeves providing negative caster; and two spaced apart frame extensions carried by the towing vehicle and extending rearwardly therefrom, each towing vehicle frame extension having a rearward end portion defining a hole for a towbar fastener pivotally connecting each towing vehicle frame extension to a forward end portion of one spaced apart parallel side beam of the towable wheeled vehicle frame.