Have you decided on a landing spot when your done travelling? After selling down on possessions, you will have some items to store, where you do that can simplify things later if you already know roughly where.
Domicile and mail forwarding, lots of threads in here on it, No state tax states are most popular, Texas, South Dakota, and Florida being common.
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Insurances, will you be on mediscare or private? If private, look at different states options, it could be an important determining factor on which state you establish as your domicile.