Ken and Shiela,
We've stayed at Swee****er Regional Park. You need to know it's also a park for horsecamping so there will be horses there. When we stayed there we had the horses and a truck camper. I wasn't all that impressed. If I remember the sites are small. I can't remember any hookups either.
There is another relatively unknown park off of Highway 52 near the #15 & 52 junction called Santee Park. They have full hookups. It's not as lush as Chula Vista; but it's in a good location, is a lot less expensive, is gated and near Mission Trails Regional park which is a nice place for hikes. It's more north of San Diego whereas Swee****er is east.
Let me know if you need any more information, we live just north of San Diego.
Marsha~