2017 Kawasaki MULE PRO-DX Diesel, Our powerful, most capable, full-size three-passenger diesel MULEâ„¢ side x side ever. The MULE PRO-DXâ„¢ features the largest steel cargo bed in its class, big enough to close the tailgate on a full-size wooden pallet (40x48 inches) with up to a 1,000-lb. cargo bed capacity* for secure transport.