If you check out websites offering a service to register vehicles in states with no sales tax you will have a better understanding of "legality" of doing so, if it is performed in the context of owning a corporation in that state. It has long been a practice of large corporations to establish a "shell" home office in those states affording the lowest tax rates...50 years ago many corps. were based in NJ for just this reason.
An over simplified explanation is: A corporation is a legal entity, and if that entity is based in a state with a mailing address, and that entity owns vehicles, then those vehicles can be registered in that state, while you the CEO of that corporation can utilize the vehicle in all 50 states, Canada, and Mexico.
CAUTION: Some states have motor vehicle laws specifically against this! A Montana lawyer will tell you that it must be researched in the state of your residency.
I find it ironic that some states have passed laws have been passed to specify exclude RV ownership from the same opportunity that the 1% use to exempt their big rigs and trailers from the same sort of law. Watch the plates on big rigs and compare that to the address on the side of the truck, an example is large corporations such as Walmart...do all of their trucks display Arkansas plates?
How many of you are old enough to remember that we did not pay sales tax on labor/services, food and clothing, or used vehicles? Just more taxation by government that the dollars just seem to disappear, and then they need more.
Food for thought:
Should a used RV be taxed thousands of dollars when sold? Does the IRS still allow for the exemption of interest paid on an RV when used as a second home?
If so, then the NEW or USED RV, being a second home should be exempt from sales tax just like your home! What about full-timers were this is their only home?
I am sorry to sound like a ticked-off person, but I am a Veteran who fought to maintain certain liberties.