Our property taxes in CA were in the neighborhood of $6,000, but CA also has a 9% income tax, and an ad valorem
annual tax on motor vehicles, on top of an 8.5% sales tax. Moving our domicile out of California saves us well over $15,000 a year in tax, more than enough to cover our diesel budget.
There are a couple of threads in the archive about choosing a state of domicile for full timers, and how to choose among the seven states with no state income tax.
Yes, we are retired. We typically "work" 3-4 months out of the year on disaster relief, but we are volunteers. The Red Cross covers our expenses when we are deployed, though. And nominally I maintain a consulting practice, but in reality I don't accept much work.