Curt Manufacturing 16636 Trailer Hitch Ideal for towing 5th wheel trailers up to 20,000 lbs. R20 5th wheel roller #16550 provides 12" of travel in the truck bed Rolls on wheels and solid, non-binding rods to be a true rolling unit Q20 spherical axial bearing for unimpeded head movement and smooth, quiet towing Dual jaws provide 360-degree kingpin contact