Reese Goose Box, 16K Rated, 2-5/16" Gooseneck RV Coupler For Lippert #1621 & #1716 Wing Sets Step up to RV comfort and keep your gooseneck hitch!Take the heavy equipment out of the truck bed! The Goose Box™ gooseneck coupler is specifically designed for RV trailer owners who wish to tow with their gooseneck hitch. The Reese® Goose Box™ replaces a traditional pin box so the RV works with the truck gooseneck hitch. Includes 5th Airborne™ technology for a superb ride.