Check the listing for details. 5th Wheel to Gooseneck Adapter Kingpin to Gooseneck Ball Adapter Fit Trailer. Color: brushed chrome, Condition: New. Listed at 53.99 USD. Product Usage：The fifth wheel to gooseneck adapter with a 2-5/16 inch ball head can be used for semi-trailers or other trucks with five wheel plates to tow gooseneck trailers. Reliable Traction：The 5th wheel adapter to gooseneck,which has passed safety testing,has a load capacity of 30,000 lbs.One-piece machining with uniform stress ensures sufficient strength and toughness to resist breakage. Durable Coating：The 5th wheel hitch uses a special coating that has passed salt spray testing;is corrosion-resistant and durable;and can withstand the test of time and harsh weather. Adaptability：The kingpin to gooseneck ball adapter can be adapted from a semi-No.5 wheel hook or a pickup No.5 wheel hook to a standard gooseneck ball coupler on a trailer.