So I just installed my Cycleracks rear rack. Thanks Don & Marc. Now I would like to put a SOLID gear box on it. My idea is that I want to mount my rotopax to the back of the box and the lid still open freely. I don't have the rear hoop on my rack so I have 14" to work with front to back, including the 3 1/2" rotopax. I would like to stay within the 18" side to side as well. Any ideas or suggestions would be most appreciated.