- Ironton Folding Trailer Kit - 4ft. x 8ft. Overall assembled length is 135in. and overall width is 62 1/4in. Payload capacity is 1,170 lbs. with a 1,400-lb. max. GVWR Includes two 4.80-12in. tires, light kit with flat 4-wire harness and connector, safety chain with S-hook, and 1 7/8in. coupler