That sounds like a really great trip.
I would suggest that you consider a couple days Sequoia NP & Kings Canyon NP too, you'll drive right past them on the way to Yosemite. You probably already know that campsites in Yosemite, as most NP, are tight and dry camping only. I imagine you will be doing lots of exploring, so for Yosemite I wouldn't worry to much about camping in valley. We stay in the park at Wowona, seems a little easier to get reservations and bit more RV friendly.
If you do add Sequoia to your plan, we typically stay outside the park at Sequoia RV Ranch in Three Rivers. By no means a resort CG, but has full hookups and several river front sites.
The "Redwoods" cover a very large area of CA north coast, I have family all over the Fort Bragg/Medocino area, so I have never taken an RV there but spent lots of time. Mackerricher SP seems to be very popular, and there are some private CG in the area.
Not sure your route, but making a loop and coming back through the eastern Sierra might be something to consider. Lassen NP is amazing and not nearly as busy as the other CA NP. As well there are some very nice places along the June Lake Loop and Devils Post Pile NP.
As you start to narrow you trip I am sure the folks here can provide a lot more specific information relating to routes and locations.
2007 Chevy Duramax LMM/Allison
2012 Jay Flight 29QBH
2012 Jay Flight 26BH (Sold)