Bk I did see your post, but I am trying to gather a concensis. You are one LEO from Co. I am not going to Co. I dont believe the law is universal. I think each state and province has there own rules like triple towing is legal some places and not others. Per your list, it is visible from 200 ft but it would take bino's to read it from that far away. Clearly its there. It is on the furthest most point of the vehical designed to hold a plate. The vehical is THE TRUCK the camper is cargo. It is 12" off the ground. Its parallel with the rear axel. From your definition the plate should stay on the truck. I think the plate holder on the camper is there for states that require the camper to be registered and have its own plate. Its much easier to steal off the camper. For me its case closed. The plate needs to remain on the vehical its registered to, unless you live in a state that requires campers to have a seperate plate. I will contintue to roll that way untill someone with a badge and a gun stops me and tells me otherwise.