If you already have established Florida residency, you keep it until you establish residency in another state. As was pointed out, you can be homeless, a vagrant, it doesn't matter in terms of residency.
Originally Posted by imconfused
Can a truck-camper be a residence in FL? I don't think they have VINs, so I guess not.
Here is a link to the state's Florida Residency Guide
. It can answer any questions you may have.
Generally residency issues arise in the state one leaves behind, especially when establishing new residency in a tax haven like Florida or Texas. New York, for one, is known to chase down its "residents", especially if they have residual business connections, bank accounts, real property or other assets remaining in NY. They particularly hate seeing those income tax revenues leaving the state.