You may want to check out
RV Goddess: My view from the passenger seat They live in Oregon and travel regularly to S. CA. (They've done the trip a BUNCH of times!) Terry reviews all the places they stay and you can search her web site or just go to "Postcards from the road" and look at the travel segment your interested in.
Be prepared! My mom is in Seattle and while S. Calif is hot and getting hotter, she's been freezing up there the last few days!
Enjoy the trip!
Mark