Favorite cities and states for RVing?

We just spent a month in the Northwest. All the way through OR and WA there are parks and campgrounds off of every highway exit. And, when we overnighted at one of the OR rest stops on the way back, we woke up to a view that I would have been willing to pay for.

I also love camping in CA and UT, but I think OR and WA are way more RV friendly.