fyi - Chula Vista supposedly has been trying to shut down for the last 2+ years. However, they remained open and was actually managed by Sun RV Resorts, I think orignally from Florida. Sun RV was building a new resort not far from Chula which is supposed to accomodate larger units, even more so than Chula.
Last I heard when I was out there earlier in the year, Chula was shutting down for good in april or so of 2021 and Sun was opening up at the same time. (you never know, till you call them). Have not followed up since. Both places would be as Capt Bill suggests. You do want to plan as early, some of the weekends may already be full. If so, sometimes, you may need to move once or twice from one site to another, to stay long term. I had to do that on a few occassions.
https://www.campspot.com/book/sun-ou...-san-diego-bay