Andersen Ultimate with Lippert 1621 HD Pin Box

When I have access to a computor I'll post photos but a fifth wheels weight is carried by the fat base of the pin box riding on the flat portion of the hitch. I don't think there are any oem pin boxes with a raised round base. With the andersen hitch adapter none of the vertical load is carried by the pin. The pin weight is all carried by two of the set screws which ride directly on the pin box base plate.