Assuming the wiring in the trailer is correct. Check the 110 volt receptacles with a polarity tester to be sure there is not a wiring problem.
The gfi problem is most likely your convertor, an older type, may have a capacitor across the input side of the transformer. The charging current of that cap will trip the GFI. Try a none GFI source for charging.
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WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles
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