I can give you so many reasons to purchase out of state. Some times I really have to wonder why anyone would ever consider purchasing an RV here for any reason other than convenience.
I purchased my 2005 Sportscoach in Jacksonville Florida. Flew there twice once to look at it, once to bring it home. Even after that I still feel like I saved about 15 - 20K. That's a lot of money.
I also paid my sales taxes in Florida, and the dealer gave me a document to take with me too the DMV when I had it inspected and registered, and California accepted that as payment for my state taxes here.
It's no secrete that many many used motor homes end up other places than California. Florida has a large amount of retirees that pass away or other wise leave these things sitting around for resale.
I'm talking used here, I know nothing about new, as my personal business experience, with this sort of thing prohibits me from ever considering purchasing something like this new. I've just never had that sort of money laying around.
When I picked up my Sportscoach, the dealer had (3) very new looking Prevosts. Truly beautiful rigs, most expensive one was about 350K. I'm certainly no expert about this sort of thing, but I kinda think these coaches sold in excess of 1.3M new.
I do buy new cars in California, not knocking the place really, just think everyone should keep there options open.