Thank you.I mounted directly to roof rails. Located at the passenger rear corner I did not notice any noise but my hearing is not acute. It works fine but you will discover that pulling it down and dumping the fuel into your main tank is slightly more bothersome that you might think. If I needed more fuel more often I would install an auxiliary tank. I don't use it often and I just remove the rails and tank as a single unit and hang it (empty) in a separate vehicle building.