The plate thing can be confusing. I forgot to move the plate from the center rear of the truck a couple times, and had to crawl under there with the camper on to retrieve it from the 'cave' to the camper. The weird thing is the plate on the camper is on the extreme right side of the rear. With left hand drive autos, this could be confusing to anyone looking for a plate.
I have 3 trailers on the property. One is my trusty 1955 Bradley which has it's own long-term plate. Then comes the 'twins': a 2002, 14' , tandem car trailer, SOA, which has a 10 yr., long-term plate bolted vertically to the fender. In the meantime I bought a small, fully enclosed, bear resistant tandem horse trailer with no floor for $200 and put a plywood floor in it to haul household trash to the dump. Not only did it have no floor it had no registration or visible VIN. Since the trailers are never used at the same time, and they are in the same basic class, i switch the one plate from one to the other making sure all the lights, brakes, and chains work and 'look' right so there is no obvious reason to pull me over. I'm only interested in the 'look' of propriety, not actual propriety.
You know, another thing: when my truck tail gate is down it is very difficult to see the rr plate. You MUST be 200' to the rear to see where it is, dimly. Tis' a quandry.
jefe