You can use St. Brendan's Isle for mailing address and keep your residency elsewhere. We are doing that until February when we'll be able to change our residency to
Florida.
The key is the difference between physical address and mailing address. In
Maryland, my physical address is a
dock that does not have mail service. My mailing address was in Virginia, now
Florida - problem; mailing address must be in
Maryland. I had Maryland mail my drivers
license to a friends house. Its a hassle. My lady's Virginia drivers
license mailing address must be in Virginia... so, it makes sense to have a mailing address in your residency state.
Cheers, RickG