Sorry guys, I just noticed the post. I don't think I am qualified to properly answer the question. I am more of an electronics engineer than an electrician. I don't know the codes, and I may not be able to forsee all the safety issues that could arrise, especially if the shore power you happen to be using is wired wrong. The double pole double throw switch idea sounds like the obvious solution but I am not able to recommend a specific switch or switch box from Granger. I also can't answer the issue of whether you need a 2nd double throw double pole switch (ganged with the first) to switch out the neutral wire. I would guess that would be the way to go but I know just enough to know that I don't know enough.
Thanks,
Ran D.
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