5th wheel with a gooseneck conversion in a short bed Dodge

I second the Andersen Ultimate. About 85 pounds for the steel version 35ish for aluminum. A fifth wheel gooseneck adapter puts leverage on the kingpin arm, and with many 5er frames being marginal already it could lead to problems. Use the Andersen adapter to bring the ball to the kingpin and you end up with the same stresses at the kingpin it was designed for. How well the design process went......