We are domiciled in S Dakota. We have our drivers licenses, voter registration, vehicles titled and plated and our insurance there. We kept the credit union we have had for years in MI. We do everything online, so it doesn't matter where I am actually at. Sign up with a mail service first - get your address and change your address on everything. They can then help you get your vehicles registered and plated before you ever go there - if you wish. When you go, you will need a receipt from a campground or hotel in both names. 2 pieces of mail each that has been sent to your new S Dakota address ( that's why you start it early - we picked mail up in person when there so we had this), your passports or birth certificates, your current drivers licenses. I think that was all. Our mail service recommended a local agent who wrote full-timers rv policies. We are very pleased with them. I contacted them before we went (by e-mail) and got quotes. We went personally and started the insurance when we were there. We use My Best Address in Sioux Falls and Dougherty Insurance Agency. The mail service website has information about establishing residency and what you need as well as forms that you can print off.