The Ultimate Cart and Dolly is made with 100% steel welded construction. The metal wheels with 15″ no flat tires, make it possible to move over 1200 lbs across rough terrain. The dolly has a standard 2″ ball and the cart has a standard 2″ hitch. The dimensions of the cart are 30″ x 52.5″ and 20″ high. This verison of our cart is made to be taken apart to have a thin profile. It folds up and comes in boxes. This version comes with 12″ side set. The coupler with the cart can be extended out to attach on a atv or quad. The reciever can take any 2″ coupler attachment.