While Shari has given you an excellent "stationary solution" in that, those units are for rent while in place. I'm thinking you're looking for something to take with you while traveling. Is that correct?
It might be helpful if you list your objectives.
1. How long will you require an Airstream?
2. Are you looking for a self contained unit or a trailer?
3. If a trailer, do you have the proper experience and, setup for towing it?
4.What are you willing to pay for the use of it?
These are but a few question.
While I'm not renting my unit out.. You might find someone on this forum who would if they understood what you're needs are.
Such as, renting it with the thought of buying it afterwards..That might be a avenue for you to contemplate.