Most gooseneck trailers are designed to be towed on a gooseneck hitch ball located in the bed of the tow vehicle. However, this king pin and pipe assembly is designed for those wanting to tow a gooseneck trailer with a 5th wheel hitch. The 4" O.D. square tube will fit as an inner pipe on most standard gooseneck outer tubes. Always follow manufacturer's torque specs when tightening set screws. This adapter is used to convert the HBQ2516ADJ Bulldog coupler to a king pin fifth wheel adapter.
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Towing capacity of the Gooseneck to Fifth Wheel Trailer Adapter - Square, for BullDog Coupler