voting and driver license issues with full time

I would verify if under Florida law that would qualify as a legal domicile address address before you jump into it. After that, you'll change all of your DL, legal documents, financial, etc to that as your permanent address. Depending on FL voting laws, you may have an issue having absentee ballots sent there, but the registrar can tell you. We have voted absentee "in" TX for 5 years with no issue using Escapees as our mail service. Good luck.

SBI mailbox is up near Jacksonville, too far north, out of my "allowed" boundary.

My question is about changing my DL, and voting if I don't physically live there.

The Escapees Florida mailbox sends all the mail to Texas for processing. It seems to me to be better to use a Florida service in the first place.

St Brendans Isle has a very good reputation and is located in Green Cove Springs FL. They been around a long time too.

Yes, you can still vote. Yes, you will need to update the address on your driver's license as the mailing service address will be your legal address. You should not have any issues. Not sure which you have chosen but I would suggest you use the Escapees FL mailing address and look to their site for details. We have been a Texas resident at the Livingston, TX address for many, many years without issue.