This is quick follow-up for people who might be following this thread.
I found a lot of very useful information about mail forwarding services in various RV forums.
As GinBoy2 indicates (above), South Dakota and Texas are good options if you want to become a resident in a tax free state.
Florida is also a tax free state and will let you become a resident (e.g. driver’s license, voting) via a mail forwarding service.
Given that I am already a (virtual/expatriate) resident of Florida via my family’s home address, I am going to try St. Brendan’s Isle mail forwarding service.
https://www.sbimailservice.com/