Taxes vary GREATLY from state to state and must be taken into consideration when picking your domicile state , purchasing your rig and planning your working future.
This site provides a clickable map to check out the regulations in the states you’re considering: Retirementliving.com
Some states also have TANGIBLE PERSONAL PROPERTY TAXES, which is basically yearly property tax on your RV/Motorhome – don’t want THAT!! Learn more about that here – and which states DON’T!