||If you get a post box at Mailboxes ETC or UPS Store in your desired state, that will work too. Just pick a state that you plan to go back to on a yearly basis, because you'll have to re-up your inspection sticker which is the only thing that can't be done by mail.
MBE is a good service and inexpensive - they will collect and hold your mail and forward it to you wherever you are in the country for free. In my exp. these stores are franchises owned by locals who are just plain good people. I had an MBE box years ago and I got christmas cookies every year from the owner. I've met several other owners through networking groups and they're all great folk.