With the CARSON 3-axle semi-trailer chassis Ver. II individual self-construction done quickly and easily. The 12-speed ball bearing wheels reduce friction. The aluminum frame is CNC machined and fits all TAMIYA tractors in 1:14 scale. The kit includes the unpainted frame with king bolts, adjustable semi-props, 3 axles with air dummies, wide tires and chrome rims, fenders, spare wheel holder with spare wheel, bumpers with rubber bumpers, 7-chamber tail lights and license plate holder (prepared for lighting).