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As I understand it, in a house neutral and ground are tied together, as is the case with many RVs. The problem I see is that an RV parked on the driveway is not grounded to the same ground as the house, or actually grounded much at all since it's isolated by the tires.
When you first plug in, I think it's possible any difference in potential between the house and the RV may cause a momentary imbalance between current in hot leg and neutral which trips the GFI. We are only talking about 5 milliamperes or so, which isn't much.
When I get back home I'm going to experiment by first grounding the RV's electrical to the house independently and then plug in. I'm curious if that will prevent tripping.
What may be happening sometimes is "similar" to what happens when we get shocked by touching a car. The difference is that GFI senses the current imbalance on initial plug-in and trips.
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