This fifth wheel to gooseneck adapter allows your gooseneck trailer to be towed by a fifth wheel hitch. The adapter has a solid 2" forged kingpin with a 1/2&quot bolster. The hardened steel 2-5/16 inch ball is machined to the kingpin and is rated for 30,000 lbs. Product is unpainted so some surface rust may be present when received. Please note: Sometimes if the trailers gooseneck is offset you may need to block your fifth wheel plate to keep it from tiliting/articulating. You may also have to adjust the main post of your gooseneck trailer to allow the trailer to ride level.