The Demco 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Hitches # DM6140 is not compatible with a recessed ball. It is compatible with a Demco hijacker hitch like # DM6076P-UL-21K, but not the Hijacker Autoslide hitch like # DM8550035.
My recommendation for your application is to use the Demco Recon Gooseneck-to-5th Wheel Trailer Hitch Adapter for Recessed Ball - Single Jaw - 21,000 lbs # DM8550046. This hitch is specifically designed for that application. There is not... view full answer...