We know a few people who do, as well as Or. Regulations vary more by county or town rather than state as far as I can tell.
Near bend, Or the county man told our friend only one RV was allowed on his 8 rural acres when we visited there. We moved a mile away to BLM land.
Another friend has property at Why, Az and has 4-5 RVs visiting nearly all the time with no problems.
I'm sure you can find something, especially in Az.
Near Pahrump, Nv we heard about some places that would probably work.
I know a couple places there where you can hang for months without issue...been there, done that and would again.