Mine is going to California...heck, I am so sick of the fact that so say CARB so say the nation....my thought is that if it's good enough for the rest of the 49 states, then it's good enough to come haunt California!
You might want to avoid the pre-1900 models. Their canvas shells do not polish up well at all. The furnace is a wood burner mounted on the ground outside the shell. The shower and toilet are external also. They do have some advantages. The mounting of the axels prevents rear sag and the light weight means they only need two horsepower. Lots of ground clearance and the treadwear with the steel tires is amazing.
Be careful of 1968 and a year or so before and after. These units were made with ALUMINUM electrical wiring for 110 volt circuits. Under load (electric heaters etc) the aluminum wiring builds resistance at the copper wall plug connection to the point that the alum wiring melts the insulation off of itself.
I had to install CO/AL wall plugs throughout the unit to reduce the tendency for coopper/aluminum resistance to build up. It is scary and best avoided.