You might be better off to look for a good restorer and go from there.
There are a lot of badly restored Airstreams out there. And they all cost a lot of money. Unless you know who did the work, and their reputation, it's a gamble with the odds against you.
I don't know who the good restorers are but this is the place to ask. If I wanted a restored Airstream I would contact the good restorers and ask if they have any trailers for sale or if any of their customers want to sell. You would be surprised how many people want a restored Airstream then change their mind. This is actually the quickest and cheapest way to get one.
Living in the trailer park of sense, looking out the window at a tornado of stupidity.