OH...I forgot to mention in the post above what the other purpose of the bolt is. It works as a dual purpose. I have a full size pickup, but no topper or anything on it, and I was always strapping my Planes in the back of it with bungee straps and such. Well occasionaly a bungee strap would inflict a little hangar rash on the Plane. A roofing buddy gave me a big flat magnet that he used for finding nails in the yards after tearing off old roofs. The magnet weighs about 4 or 5 pounds, and I can just lay it in the back of my truck, and stick the tail of the Plane right to it. You might not think this would hold that great, but it really sticks hard to it and the Plane don't move at all just so long as I chalk the wheels. Best of all.......NO HANGAR RASH!