We are residents of SD that winter in our S&B in Queen Creek AZ. Our vehicles are registered in SD. Our drivers licenses are in SD. Our Medicare coverage is via Humana Gold Choice PFFS and it's good nation wide as long as the Dr and hospital will accept the Humana prices. We used Americas Mailbox mail forwarding service in Box Elder SD as our residence. Contact them and they will guide you through the process. If you want to winter in AZ, you can own a home there, you can own a vehicle there as long as it is registered in AZ (we leave our beater pickup in AZ). But you must adhere to the residency laws for AZ and SD. We are on the road from May to November and our medical is covered where ever we have a need.
PM me if you have any questions.