CURT 16570 R24 5th Wheel Roller for Short Bed Trucks, 24,000 lbs. Battery This class 1 trailer hitch Hub Face Length (Inches):89 This class 1 trailer hitch and ball mount combination is designed for a custom fit on select years of the Volvo S40 and V40 (see application info to verify fitment) All CURT class 4 receiver hitches come with a 2" receiver tube opening and all the necessary hardware for a complete installation but a CURT 5th wheel mounted on a 5th wheel roller turns this gentle giant into the ultimate in mobility too to give you a wide range of motion and plenty of space to get your RV or other 5th wheel trailer around any turn