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GFI SIMPLE EXPLANATION
A GFI outlet checks the amount of power going out the black wire (hot) and monitors to see the same amount comes back thru the white wire (neutral) If the amounts differ then it sees this as leaking power because they should match so it trips the GFI. The ground is not monitored but if something shorts out, it shorts to ground to prevent electrocution.
This is why a GFI neutral can't be combined with other neutrals from other circuits.
The ground don't matter in a GFI circuit other than the safety it provides. Thor could have just miswired my unit and that's not why the rest of the Aria 3901's keep blowing the GFI, but the problem I found was part of the loom and I bet there are more done like mine. They can change the GFI's, inverters, etc and the problem isn't going away the way it is wired.
Happy camping
Fred
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