Two mobile home axles with four wheels. Electric brakes on one axle. FYI, the heaviest load that I carried on this was a 10,000 pound bulldozer with a 2000 pound blade. The trailer handled excellent, but I do not recommend it. At the time I was young and adventurous. It has a long tongue which enables me to haul 20 foot Lumber safely without fishtailing. The axles themselves rate up at 14,000 pounds. Dimensions 6‘ x 9‘ long. The sides are about 18 inches and are removable. Of course, the price is negotiable.