Orangeland RV park is about 30minutes south of LA close to I-5.
Newport Dunes is about 45min south,and right on Newport bay.
The travel times are during non-traffic hours, 11:00 AM to 2:30Am or really early or really late. Traffic is quite bad in and around LA during rush hour.
There are some parks in the Van Nuys area, which you can find on www.woodalls.com.
They will have you do a log-in account, but it's harmless. I have not received junk mail from them.
I would have to know how close to LA youwant to be in order to helpo you further.