It really kinda depends on your RV..what is it? And how adept are you at ferreting put boondocing sites? For instances, if you have a smallishy T/C you can just melt into the fabric of any wee town you happen across. If you are BIG...then you have a problem. Also, there was always lots of logging taking place along the coasts of both states..again, smaller is better. Your best pal is Google maps..go for a drive and you'll see lots of opportunities.
In northern California there is a parking lot that has a Host in place and they allow for overnight camping, for a fee. Tt's AT the beach, not so much ON. It's is just south of Crescent City.
Back when George, the Vagabond Supreme was publishing his blog, he spoke often of two kinds of boondocking sites. The Day and the Night. I follow it, to this day. Day site is where you want to spend the day..beach, park...whatever. Night is when you have scouted out the over-night spots. And you head there when day is done and you are looking to sleep. Usually beaches and such are open till 11pm. You should be able to spend a great day and then off to sleep..and if it was a place you want to spend a couple days...they open back up at 6 or 7. First in...best spot.
Gary Haupt