Curt Manufacturing 16550 Towing Wiring Allows for forward and rearward movement of 5th wheel hitch for added clearance For use with the CURT Q20 5th wheel hitch head #16530 Ideal for towing 5th wheel trailers with large overhangs up to 20,000 lbs. Constructed with solid, non-binding rods that lock the hitch into position Designed to be a true rolling unit, not just a slider