Casini Ranch Family Campground is another option. It is west of Santa Rosa on River Road in Duncan Mills along the Russian River. We stay there fairly regularly and will be there this weekend. Cloverdale north of Santa Rosa also has a KOA. Rohnert Park and Windsor have small commercial RV parks that have a lot of full timers in them, but rent spaces for travelers. I can’t think of the names of them off the top of my head, but a quick google search should bring them up. The fairgrounds RV Park is fairly full these days with workers and displaced home owners from the fires, but they should have a few open spots for travelers. If you want to be in Santa Rosa, it is pretty much your only option with a larger size rig. If your rig is small enough, you could also try Spring Lake Park on the east side of Santa Rosa. I can’t remember if they have hookups though.