Sid,
Sorry to hear about that. Sure sounds like CA is starting to enforce this stuff, along with some other states.
Personally, I was afraid to try the Montana LLC with my two coaches. Others will certainly disagree, but I felt wrong trying to not pay any taxes by doing that, when the coach was stored in CA, driven in CA, with a CA toad and DL etc, etc.
I will admit, I hated the high cost of it however. It was downright painful when I registered my last coach.
Ray