Dman,
Everyone has to register in some State. If you are a full timer, you can register in any State. I have been licensed and registered in Oregon for about 10 years.
Oregon supplies two year plates. As an RVer, one can come and go, stay in any State as long as they choose. Don't change license and registration just because you may be in another State for 6 months or more.
We are in Yuma AZ now, we've been back to Portland OR, stayed a couple of months in Vegas. Well be back in KC in the Spring.
I should have changed my addrss to: "on the road".
onezman
http://onezman.tripod.com/yourrvhaulercom