I did something similar.... I lived in my previous 27' Overlander for 2 years while renovating an old bungalow I purchased. I had already been fixing the trailer up for a number of years so it was ready for the job. I ran a 30 amp line from the house panel, and hooked to the well and septic. It sure made working on an uninhabitable house a lot easier! However, depending upon the level of repair that your Airstream will need to travel and be lived in... don't expect to $ave any money. Oh, and allow lots of time.
If you enjoy doing the kind of work necessary to revive an Airstream, you will definitely want that trailer as part of your life afterwards. Read through much of the repairs done on older trailers and you can see what you may be in for. Hopefully your trailer is further along in the recovery process!
I just purchased a new (to me) 1977 31' Sovereign
. I'm gue$$timating and planning for at least 5-7K in play money to get it roadworthy and livable. It is worth every penny to me. Oh, and the time it takes.
Good luck and keep us posted.