Andersen Ultimate 5th Wheel Connection -- Wreck ????

I would imagine the "alt physics" are the same ones that work with a direct gooseneck hitch. The load is supported by the gooseneck ball which is bolted to the Companion base. Pretty easy to understand. The bed will probably deform some as the weight is applied, but only until the weight is supported by the turnover ball, then the weight is supported by the gooseneck/turnover ball structure under the bed, that is bolted to the frame.