Want to tow a gooseneck trailer with your existing Traditional Series SuperRails? This great add-on will get you on the road with confidence and strength! Simply unpin and remove your SuperGlide hitch and pin in this gooseneck adapter! The 18K Gooseneck adapter fits 18K/14K/16K SuperGlide hitches on both Universal Base Rails, and on SuperRails. All Goosenecks include the ball.