Where to park/store my trailer (Southern California)

Hello!
I'm a new hot shot driver transporting motorcycles, side by sides, golf carts etc. in a 44' enclosed goose neck trailer (towed by a dually). I live in Orange County, Southern California near 57/60/91/5 freeways. I can park my truck at my house but need a place to park/store the trailer between runs. Most cities near me don't allow overnight parking on the streets. The RV storage yards near me can't accommodate a trailer this size and/or are too tight to maneuver in and out of. Wondering where other independent drivers park/store their rigs when not on the road.
Have been researching online and calling around; availability seems scarce and the few (two) really large lots I found that offer day and long-term parking have bad reviews (lots of theft!).
Anyone in my area have a suggestion?
Thanks in advance!

 

Good suggestions thanks! Looked at RCR in Ontario (that's one that had not great reviews) and tried to reach IE Truck Park in Fontana but haven't gotten a call back. I'll keep looking!