Less expensive than robots. Tow tons of trash, corrugated or bubble. Safely link up to 3 trucks at a time. Tow up to 5 mph. Leakproof polyethylene body won't dent or corrode. Tubular steel frame. Includes heavy-duty tow bar and hitch pin. 2 large 16" pneumatic wheels, 2 swivel non-marking casters. Optional Hinged Lid available.ULINE offers over 41,000 boxes, plastic poly bags, mailing tubes, warehouse supplies and bubble wrap for your storage, packaging, or shipping supplies.