This fifth wheel gooseneck adapter allows you to tow your fifth wheel trailer with the convenience of a 2-5/16 Inch gooseneck ball. This enables the full use of the pickup bed when it's not being used for towing. User-friendly features include 4 Inch height adjustment, a variety of offsets, and a precision cast, self-latching coupler. The coupler can be unlatched without getting in the bed of the truck by way of the cable assembly that is provided with each unit. Adjustable in height from 12.5 Inch to 16.5 Inch to accommodate different height trucks and trailers. Measure from top of ball to king pin plate.