You might try calling the park and asking. (707) 465-7347
Not at this park and not quite your exact situation but I'll add it as food for thought: I've had bad experiences trying to camp with a tent group in California state parks when I have my RV. They get a group site and they all camp there together and all of the group events are there, but the rangers make me get another site for my little TC-sized RV even though it would fit in one of the parking spaces at the group site. I make a lot of trips back and forth and/or feel rather isolated.