CURT Industry-Standard 5th Wheel Hitch Rails, Gloss Black, 25,000 Pounds Model 16104CURT Industry Standard 5th Wheel Hitch Rails, Gloss Black, 25,000 Pounds Model 16104 CURT 5th wheel base rails are industry standard, meaning they can be used with any 5th wheel trailer hitch with industry standard anchoring points. They are compatible with virtually all CURT 5th wheel trailer hitches and many competitors. Installation of CURT universal 5th wheel base rails is quick and simple. They mount with high strength hardware, providing a solid