I have long said many RVers have a few screws loose, and have been recently reminded that there are Loose Nuts in many RV's as well.
Of course since this is the 2nd post in this thread everyone will understand I'm talking about Real nuts, bolts and screws the kind you tighten with screwdrivers and wrenches..... Not the other kind
Any place a copper wire joins a steel frame... This can happen. in fact any place two DIFFERENT metals interact, this can happen.