"A complete, step-by-step procedure of construction including DOT-approved lighting/wiring schematic and bill of materials. Features welding procedures along with tips and tricks. Copyrighted, engineer-approved drawings are 120 scale on 24in. x 36in. sheets. Shows 20 steps to build. U.S.A. Note This item can NOT be returned. DOT Approved Yes, Blueprint Description Car, Trailer Size ft. 26 x 8 1/2, Trailer Capacity lbs. 14,000, Blueprint Scale 120."