It sounds like your physical ground (the bare copper wire) is not connected "somewhere"... Possibly it vibrated loose in the trailer or you could have a loose connection "almost anywhere"... I'd be very cautious until you find the cause. My guess is the 15 amp circuit/plug at the house, but it could be anywhere in the entire circuit.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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