Curt Manufacturing 16616 Towing Wiring Designed to tow 5th wheel trailers up to 16,000 lbs. R16 5th wheel roller #16560 provides 12" of travel in the truck bed Rolls on wheels and solid, non-binding rods to be a true rolling unit E16 hitch pivots on dual axles for ten degrees of lateral movement Automatically locks for easy, secure coupling