I've stayed at, and can recommend, Cal Expo in Sacramento, Flag City RV in Lodi, Premier and Mountain Gate in Redding. Haven't stayed at, but have checked out and would stay at, Durango in Red Bluff and the one at the casino near Corning. About this time a few years back, overnighted at a park on the west side of the freeway about midway between Redding and Sacramento. Ants infested the RV by morning. Somewhere along there is a park next to a golf course. It's been over a decade, but it was nice as I remember.
With family in both Pismo and Redding, we always stay at Flag City RV. It's right off 5. Passport America park. A few miles to the east (Highway 12, I think) is all kinds of shopping, including In 'n Out Burger.
If you decide on Cal Expo, get there before the afternoon rush hour traffic.
