Long lasting high gloss powder coat finish. Heavy-duty 4 bolt trailer hubs for towing, Auto-idle. 16 long lasting carrier bolts and rubber torsion axle. Max towing speed: 45 MPH unpaved / 55 MPH paved. Heavy-duty steel fenders. Nylon sleeved high pressure hoses. Heavy-duty crank down wheel jack for easy moving. Spring loaded vertical and horizontal rail locks. High pressure hoses on both the pressure & return side 2" hitch coupler.