$147-Flip Over Gooseneck Hitch Accessories | FL2 King Pin for FlipOver Hitch to hook to a inverted 5th wheel hitch, this is NOT a double kingpin. Hitches & Couplers
B&W (RVK3300) Companion 20K Fifth Wheel Hitch For Ford Superduty With Factory OEM Under-Bed Rails
B&W Companion 5th Wheel Hitch | RealTruck
Gooseneck Bent Plate-2-5/16" trailer ball included-Mounts to all standard fifth wheel rails-Durable powder coat finish resists rust and corrosion