Foodsman, I would agree that the guy seemed to have done his homework. My concern for doing the same thing is only that you need a "location" for full timing and to utilize the Montana LLC. If he still had a NY driver's license and the dealer took a copy of that license, which I believe is done in all states, then that information may get transmitted to NY and voila, he's getting notices. Now, let me add to that. If he still had a NY license and can prove that he had not returned to NY for more than 30 days at a time with the RV, he would be able to work his scenario without a hitch. It would just be a matter of responding the notice from NY with his documentation and theoretically that would be the end of the question.
As to any perceived moral issue I don't think there are very many of us that intentionally pay more in taxes than we owe. Your interest on your RV is deductible so do you not take it so that you can pay more in taxes than you owe? I don't think there are too many RV owners who would do this, if there are any!