I dont have a back up light on my Cougar, but I plan to get one or two. I had one on my 06CougarFTD and one on my Baycat, never had any water issues with them. The Baycat, I put in salt water. As far as legal is concerned with those stickers (mine has them on the trailer on both sides), I really dont know. I do know someone on here, I believe, posted that he had the LED tail lights and was stopped by a policeman who told him that since the lights didnt have reflectors, that he was illegal. But he also had the stickers on his rig. I dont remember how that came out though.