Using an umounted panel, attach it to a plywood sheet, then adapt its connectors to a long 10-12G cable that can be terminated to the trailer hitch plug. Drill a 1" hole in the Camper to accept the trailer hitch socket. Wire the panel positive to TWO trailer hitch posts, and the panel negative to the other pair of posts.

When not being used, the panel can be easily stored inside the Camper along with its cord. Now this setup can be oriented to the sun at 90˚ for maximum efficiency, and the Campers location now is no longer a factor.