2017 Kawasaki Mule PRO-DX Diesel, Our powerful, most capable, full-size, three-passenger diesel Mule™ Side x Side ever. The 2017 Mule PRO-DX™ features the largest steel cargo bed in its class, big enough to close the tailgate on a full-size wooden pallet (40 x 48 inches) with up to a 1,000-pound cargo bed capacity (600-pound maximum cargo bed capacity for California models) for secure transport.