We have a Trailersaver BD3 on our GMC Sierra 3500 and are towing a Landmark Rushmore. Our hitch is mounted using its factory standard setting, but I believe it's adjustable up or down by shifting to different mounting holes. When the Rushmore is hitched up, I have almost 6 inches of rail clearance, the nose is close to level, and the hitch is centered vertically. By adding air to lift the hitch, I can get another 1 1/2" of rail clearance (but I would think that to tow that way might cause undue stress on the parts).