Tony,
Man I love the idea but, an Airstream may be a little too cramped to be a viable store. Maybe a store front. You know take an Airstream that is "too far gone" to put back on the road and use it as a gateway to your shop. Kind of like a dinner from the 50's with the streamlined trailer/rail car in the front and the rest of the dinner to the side and or back.
As for living in your Airstream in the cold climate....
How much do you really like Ron?
It will be very cold and take a lot of LPG to keep the trailer warm, plus the close quarters.
You should really hook up with flamingo-kid1, she has her own shop and can give you a lot of insight as to the ins and outs.
I also want to pull up and settle out west, but I have the wife and three kids....