The first one I built was using a 18 ft. camper frame, cut down two mobile home axles, welded on two strips of 1/8" x 2' x 16' wide diamond plate and some fenders. Light weight, I think 1100 lbs. Paid $150. for the frame, $35.00 ea. for the axels with tires and springs. Can't remember what the steel was. Still use it today to haul lumber as i use my enclosed for my cars garage.