That's funny. We have been to the local DMV on five different occasions, three time on the phone with Sacramento, and twice to the Bakersfield DMV office. Just about each and every time, they come up with another problem or something else we have to do. We bought the mh in Oregon in August, initially tried to register it in California in October and to date we STILL have not been able to satisfy all their requirements. Typically, the local office agents didn't have a clue (small office and they normally don't deal with large DP motorhomes), the Bakersfield office inspected the coach and provide the correct form that I sent off to Sacramento (required) and only recently have we been notified that they (DMV or LEO) has to physically inspect the coach and read this "emission tag" on the engine personally!!!
Tried to register?? Yep, I think we have.
So now the issue is the fact that they (DMV or LEO) has to inspect the engine tag. So, I've found the tag, but as I mentioned, I can't find anything about California emission standard on the tag...but did fine CARB on it....which I think should satisfy them, but won't know until I take a picture of it and take it up to the local DMV.
FWIW....at no time has there been one word about getting it "smog"inspected as you're correct in that 14,000+ lb diesel motor homes are exempt. But the engine still has to conform to California Emission Standards.
Ron