- Ironton Heavy-Duty Trailer Kit - 5ft. x 8ft, 5.30-12in. Tires 136in.L x 76in.W overall size with 1715-lb. payload capacity Rolls smoothly on two 5.30-12in. tires with protective fenders to prevent rocks and debris from damaging your cargo Includes safety chains and light kit so you can hit the road immediately 2in. coupler assembly and wiring harness connect to your vehicle to ensure trailer safety on the road, even in dark or rainy conditions Customizable steel deck area to handle large loads