If I had a camper with an aluminum roof parked in the yard, and I was going to use it for a ham shack...
I'd have me some thin steel plates made. I'd put them on the roof and stick mag mounts on them. I would assume, until I proved myself wrong, that capacitive coupling would electrically attach my antennas to that lovely ground plane just like on a car.
I'd do this probably for 10m and up.
I might put a thin rubber barrier between my plates and my roof, made from old inner tubes or what ever. And I'd give it a try and see what it does. It might work.
For HF work I'd get something like a Butternut vertical and mount it to the tongue. Might need the radial kit. I wouldn't make them permanent, so I could roll them up to mow the yard and roll them back out again.
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