I plan on doing this next year. There are loads of blogs on this - both for the international traveler and with in the US (RV'er sites are good).
As for mail, I want to keep my Washington state address (current resident for 10 years) so a state taxman doesn't come after me so I'm going to put everything I can on e-delivery, and opt out of offers and change my address to a friend's house. I'll pay him something. My driver's license doesn't renew for 5 years so we'll have to deal when that time comes. Perhaps move back for awhile and stay with said friend.
Another alternative is get a PO Box (cheap) or UPS store box (expensive, but is a street address that you may need for residency. they can also forward mail for a fee).
I'm not keeping my car, but tab renewal would be a little challenging - would need to at least forward mail with tab to you.