Someone from California should chime in here. As I understand the new laws governing emissions in California, they don't apply to Motorhomes and RV's but only to commercial vehicles, i.e. buses for hire and/or school buses. So the buses are being sold as either "move out of state" or convert to MH. Sadly the schools are getting a fortune from the government to crush the offending vehicles. This is the reason that Crowns are now on the "endangered list"
Hope this helps ease your mind until someone with a better grip on the rules shows up.