(B&W Trailer Hitches) The B&W Extend-A-Goose Coupler adds clearance for your gooseneck trailer. The 10" Extend-A-Goose Coupler slides into any standard 4" ID round trailer coupler tube, increasing the distance between truck and trailer. Adds turning clearance between truck cab and trailer. Adds clearance between tailgate and trailer. Ideal for short bed trucks. Built from precisely cut and welded heavy-wall tubing with strong internal gussets. Rated for 24,000 gross trailer weight and 10,000 lb tongue weight. Long-lasting powder coated gray finish.