I suspect that he is really not hooked up to a "frame" or ground reference.
Many times ladders, gutters and such on RVs are not ground electrically.
You need to check this out and make sure.
And many older RVs that I have had have wooden frames holding the fiberglass up so there is no ground there either.
Use a meter and find out if what you are hooked to to really the frame or negative side of the battery.
You just might be surprised.
Boats are even worse to deal with, been there and done that.
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