DrewE wrote:
Even with reversed polarity, you should not have 120V on the RV chassis unless the ground wire from the receptacle was also reversed and wired to the hot (at, say, the main electric panel). Having that sort of stray voltage indicates at the very least poor grounding, and quite possibly also a neutral to ground fault in the RV. I would guess that if you plugged the RV into a GFCI protected receptacle the GFCI would pop due to a ground fault.
Good point. Since the power converter should be wired as a sub-panel with isolated ground, this should not happen.