For those who are interested, there are multiple iPhone & Android apps that help prove 'non-residency' by recording GPS localization on a daily (or better) basis. As well the app(s) frequently help in establishing the various legal proofs needed to show changed residency.
FYI though, there is a history of the states trying to continue taxation of pensions earned within and while a state resident. While this was killed decades ago by a US Supreme Court decision, I can see it coming back by a US Congress law.
Thanks for the info.
A few of the especially important things to do are file a declaration of domicile, register to vote, get new driver’s license and tags, change address on key accounts, and apply for homestead exemption.