My child bride is not old enough for Medicare (that changes in November this year). When we retired and went full-time, we lived in Texas and simply 'moved' to Livingston. At the time, we were both signed up for individual PPO health insurance. A couple of years later, insurance companies in Texas stopped offering individual PPO policies. By that time I was on Medicare, but not so for my wife.
Our first move was to Washington state. No income tax, low registration fees, reasonable insurance rates. Becoming a resident was easy. For the motor home, we had to pay the difference between the sales tax we paid and the higher rate in Washington. Meeting the requirements of the health insurance company was daunting. We needed an electric bill or some such, which we didn't have. We finally satisfied them, I can't recall how. A few months later, they too stopped offering individual PPOs.
Next stop was Florida. We read all the requirements on the Escapees site and made sure we followed them to the letter. We flew into Orlando with our documents, stopped in the county offices in The Villages. 90 minutes later, we left with new permanent drivers licenses, plates, registrations, and titles. Registration was inexpensive. Then came the phone call to the insurance company for our vehicles. After giving them all the information about our move, they quoted premiums that were more than double what we were paying in Washington. A change of insurance companies managed to keep the premium increase to about 50% more.
My bride is going to qualify for Medicare at the end of 2022. Once she does, we'll 'move' again. I am guessing the insurance premium savings for the first year will pay for the trip to wherever we need to go.