[cwl1979]

Carl,
This is from the link you posted:

“For information on vehicles that are exempt from Clean Truck Check, please refer to the Fact Sheet: Compliance Requirements Overview (link to the passage listed below)”

Which the link then states this:

“Which vehicles are not subject to the regulation?
The heavy-duty vehicle types shown below are not subject to the regulation:
…Motorhomes registered outside of California“


The laws are written in such a way to give enforcement officials extreme latitude.  Many folks would not argue, pay what ever fines are incorrectly imposed and go on their way.  California has never had clear cut laws. 

It’s going to be a mess, no matter how it’s interpreted.  Sad, as there are lots of really neat places to explore and things to do in the state.

In the link i posted it clearly states that even out of state motorhomes need to comply. Date of compliance will correspond to the last digit of their vin number. See table II. Mine being 435 I have to comply by March of next year.
     
I personally could care less for ever visiting California. Their laws are intentionally vague and intentionally traffic congesting, purely to try to justify CARB. Even though they have publicly admitted that it has no effect and actually causes more harm then good. More so because of their dumb speed limit. Same reason i will never personally take a 3 axle vehicle anywhere on the west coast.