We relocated to FL from VA a year ago. FL has no special provisions for driver's licensing for an RV of any weight. FL has no vehicle inspections, except at time of initial registration. At the time of initial registration your VIN has to be verified. This can be done by a sheriff or licensed vehicle dealer.

As for the USPS forwarding, I haven't had any problems yet. You should be able to have mail forwarded on a temporary basis to your VA address from you permanent FL address. They will not allow you to keep changing the temporary addresses. The process is to pick a temporary address (we pick my daughter's house), set the forwarding time, finally cancel forwarding. This same process will have to be done again next year.