When I said it’s not a “given”, it means it is not physically necessary and therefore we can’t assume it so. It may have been cheaper to wire that way (even if it doesn’t meet code — I’m not sure on that — people can take shortcuts to save money), but who cares why it could happen. The possibility is there. Assume nothing until confirmed. Regardless, it doesn’t matter either way because once L1 and L2 current is combined coming out of 50-Amp motorhome into a single neutral, the adaptor can not split it so precisely that the GFI protected circuit will receive exactly the same current in and out, and will trip.
For what it’s worth, I’ve stayed at one campground where even the 30-Amp service was GFI protected. That would further complicate matters using this adapter. That particular campground also had 50-A service so adapter wouldn’t have been required in the first place.
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