Sorry I cannot help with medical, but I have a couple of recommendations for handling other issues.
1. Be very careful in picking your RV insurance company and policy. Most are not designed for a full timer and contents are minimally covered. There is a good reason for this since it avoids double coverage for most people because their homeowners or renters policy will cover contents.
2. You want to establish a mailing service in advance. Since you are currently in Idaho, I recommend South Dakota for residency and mailing service. You need to transfer at least your bank address a month or so in advance so you can bring in a statement with the SD address when you register with DMV. SD is very friendly for traveling residents: no income taxes, several good choices for mailing service, no annual vehicle inspections, low costs for vehicle insurance.
3. There are a lot of choices on how to get mail and packages from your mailing service. We traveled a lot so when we were in an area and ready for a mail drop, we emailed the service at least 2 days in advance. They forwarded with USPS priority mail.
4. You want to be as paperless as possible well in advance of traveling or changing your State for residency. It is pretty easy to set up paperless so your actual snail mail is close to unnecessary.
5. Never rely on the Post Office to forward mail. Weeks after our mail was supposed to be forwarded they were still leaving our mail in the old mailbox.
6. Again set up forwarding, paperless and everything else you will need at least a couple of months in advance. I remember finding somewhere around 50-60 places that we needed to notify for our change of address.
7. Be careful about the appearance of your new address. It will likely include a PMB (personal mailbox) number. Do not use PMB on your address. Just include the number as if it is an apartment number. Many financial institutions want an actual address and will not accept a PO Box. Don't lie but just avoid the issue.
8. I recommend you file IRS form 8822 for change of address. It is not absolutely necessary but is another means of documenting your change of address even though you will not be living in South Dakota.
