I have been cited for not having a license on the rear of my truck when it was mounted in the back window as I did nor have a bumper at the time. I have been cited for having a hitch ball on a bumper mount as it obscured the license, I have friends that have gotten tagged because of bike racks obscuring the license. My opinion is after all that' is if there is a spot on the camper for a license then that is where it should go when the camper is on the truck. I don't have to worry about LEO as my wife is sure to remind me before we leave, and believe me I would rather deal with a LEO on this matter. This discussion could go on till the end of time but the reality is,do you want to give them(both the DW or LEO) a reason,is it REALLY worth it? Not for me, I put mine on the camper when it is on the truck and I don't have to worry about the DW the heck with LEO.