These fifth wheel gooseneck adapters clamp to the king pin and bolt to the king pin box on a travel type trailer so it can be towed with the convenience of a 2-5/16" gooseneck ball. This allows the full use of the pickup bed when it is not being used for towing. User-friendly features include height adjustment, a variety of offsets, and a GN8 cast coupler that latches when lowered onto a gooseneck ball. The GN8 coupler releases remotely with a cable. RV4 - Flatbed application 9" offset w/7-1/2" fixed height