That is called, "Hot Skin". It's caused by a failure to be grounded properly when plugged into shore power.
There is probably absolutely nothing wrong with your camper. What is wrong is the electrical outlet the camper is plugged into. It is not grounded. Or, your electric power cord for the camper has a break in the ground wire somewhere. Most likely, if it's the electric cord, the problem is in the male end of the plug.
I had this same problem a few years ago with a previous trailer than had aluminum skin. I was running one of those orange construction style 15 amp electric cords from the house to the camper, and it was 100 feet long.
Every time I reached for the door handle, I got the "Hot Skin" buzz. Thanks to another forum at that time, I read about proper grounding. Then I realized that 100 foot cord I was using did NOT have the 3rd prong (the ground prong).
I switched electric cords to one that did have the 3 prongs and never had that issued, ever again.
So, I'd start with the electric outlet and then second, check out the electric cord. Again... I doubt anything is wrong with the camper!
EDIT:
I just went back and read the previous posts. I see you found the problem. Glad it was nothing wrong with the camper!
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2019 Montana High Country 375FL
2014 Chevy Duramax HD 6.6 - 3500 Diesel Dully Long bed Crew Cab
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