rv parks on califorinia I-5

We drove from Sac to Yuma yesterday and today and I 5 was really busy, traffic actually stopped at times. It was a mad house. We stopped in Bakersfield for the night. Today the wind was really blowing over the Grape Vine and thru LA

It's only about 170 miles between Valencia and Sommerville (Almond Tree) RV park; that may be fewer miles than the OP wants to travel? There are a couple of places in Santa Nella; check RV Park Reviews. But, one can go about 25 miles or so north on I-5 to the Kit Fox RV park that "lanerd" suggested; IMO, it's a better choice than either of the options in Santa Nella.

Sommerville Almond Tree RV park in Coalinga was a nice stop. Our last stop there we got in just before the office closed at 5pm, but I was told people just pull into any open spot and check in in the morning. Very clean, shape and grass, a nice overnight stop. https://www.sommervillervpark.com/ Streets and Trips show the location a distance off the road, but the reality is it is just off the I-5 exit.

The only other one I've stay at is at Kit Fox rv park in Patterson. Nothing special but good for an over nighter.

Ron