Each US state is required to develop a detailed plan for distribution of Coronavirus vaccine. Those plans were due on Nov 1 2020.
It appears that the vaccine distribution to the more generalized public (e.g. seniors without co-morbidity complications) will be regulated by each one of the states. The state plans that I've seen appear emphasize protection (by way of vaccine distribution) to it's residents. Vaccination records will be maintained by the state.
So where does that leave longer-term tourists that are non-residents?
Tens of millions of seniors (of varying health conditions) will spend the first four months of 2021 out-of-state. Will they be required to return to their permanent residence sate to be vaccinated?
I have not found any discussion on this -- perhaps SE members have.