2 things I don't see in this thread....
It seems common for people to take delivery of motorhomes in Nevada, even if a California resident purchasing from a California dealer, to avoid California sales tax. If the RV never crosses the state line they cannot tax it.
On the residence thing, theses days for pre medicare folks, the biggie on domicile will be "where can I "(not) live" and still get nationwide obamacare coverage?
We can always hope this will become a moot point, but for now, a nationwide network is huge for travelling RVers, and you cannot get those from everywhere.