$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
KPGA-1216O --- Convert-A-Ball King Pin to Cushioned Gooseneck Adapter - 20,000 lb Capacity
Amazon.com: Wallace Forge Kingpin to Gooseneck Ball Adapter - Made in U.S.A. : Automotive
Gooseneck to Kingpin Adapters - PJ Trailers
Gooseneck to Kingpin Adapter (Round or Square) | Nationwide Trailer Parts
KPGA-1216C --- Convert-A-Ball King Pin to Cushioned Gooseneck Adapter - 20,000 lb Capacity
5th Wheel Goosneck to Kingpin Adapter with 4.5" Square Tube | Camping World
Wallace Forge Gooseneck King Pin Ball Fifth Wheel Adapter at Tractor Supply Co.
RV4XL Kingpin to Gooseneck Adapter - Pop Up Hitch
How to Install Kingpins — Tulga Fifth Wheel Co.
BW4000 --- B&W Inverted Kingpin Adapter
Rear Gooseneck Adapter 2-5/16" Ball & 2" King Pin Silver For Trailer Fifth Wheel | eBay
King Pin Fifth Wheel Adapter for Steve's Hitch : Steve's Hitch
Kingpin Adapter – KP421 | Southwest Wheel
Amazon.com: Gooseneck Ball Adapter - Fifth Wheel Kingpin to 2-5/16 Inch Gooseneck Ball Towing Receiver Adapter - Silver : Automotive
Amazon.com: Kingpin to 2-5/16" Gooseneck Ball Adapter 30K Zinc Plated - Made in USA! : Automotive
Wallace Forge King Pin to Gooseneck Ball Adapter | Fayette Trailers LLC