I found the same information online as everyone else did and I know people break the rules (I was trying not too). I'd only fall under two criteria of working in California.
Accept gainful employment in California.
Claim a homeowner's exemption in California.
Rent or lease a residence in California.
Intend to live or be located here on a permanent basis (for example, acquire a California driver license, acquire other licenses not ordinarily extended to a nonresident, registered to vote).
Enroll in an institution of higher learning as a California resident or enroll their dependents in school (K-12).
The renter criteria, I know I could avoid. The gainful employment part is so subjective and under that blanket statement, it would apply to guest workers, etc.
The only option I thought of was to transfer the cars to someone else's name with an Ohio mailing address. I'd have to get a California Drivers License and insurance. These two things may supersede the owner's address of the car, but I'm not 100% sure.
(Would this work? @1fastSTI)
My Mustang would undoubtedly fail E-Check so yeah...