I have considered the RV thing, as I have some friends that are doing it. Unless you are "boondocking" or "dry camping", you are basically paying the taxes the the owner of the park has to pay. While in Driving - of course the taxes at the pump are where they are getting you.
I'm Cheering for Solar Charged All Electric RV drive trains. Someday maybe.
As they say - the truth of Life is there is no escape from Death and Taxes.