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[Chance]

My neutral wiring was grounded at one location, and once I separated it, the problem went away.

I had not really thought about the problem fully until I consulted with a family member who’s an electrical engineer with lots of experience in this area.

As he explained it, even if there is a tiny bit of voltage at neutral at plug (talking about very low voltage due to normal voltage drop in house or campground wiring), then when I plugged in, that tiny bit of voltage would send a tiny amount of current down my neutral and back on ground wires.

Since the GFI compares current between neutral and power, it sees very low current on neutral, but not on line, so it tripped instantly even if I had nothing on inside camper.

If neutral and ground are connected at all, a GFI will likely trip instantly. It doesn’t take much because GFI trip at very low current differences, and since wires have very little resistance, even a “minor” voltage difference between ground and neutral will exceed the milliamps required.