I purchased the Atwood Power Trailer Tongue Jack (Model 08515), which has worked well for us for a couple of years. The review below is dated 06/26/11; but the jack was actually purchased a year or two before this, and that's the date when I finally got around to writing the review on Amazon.com.
Please note the load rating of this jack. Depending on your Airstream model, tongue weight and tow vehicle, you may need a jack of different capacity (e.g., heavy duty, 3,500 pounds)
Atwood Mobile Products 80515 Marine Deluxe Power Jack: Amazon.com: Sports & Outdoors
Extract of Amazon.com product review:
Atwood Power Trailer Tongue Jack (Model 08515), June 26, 2011 -- 5.0 out of 5 stars
By Arizona Airstreamer (Phoenix, AZ USA) (a.k.a., "Phoenix" on Airforums.com)
Amazon Verified Purchase
This review is from: Atwood Mobile Products 80515 Marine Deluxe Power Jack (Automotive)
It gets really hot in the desert southwest in the summer, and I was looking for things that would decrease the hook-up time and effort for our travel trailer. I originally thought that a power tongue jack was an unnecessary luxury. However, I got it anyway to help my wife, since she was usually the one that jacked up the tongue of the trailer.
The installation was quick and easy, since this was a direct replacement (same mounting holes) for the hand-cranked, manual jack; and this device has made hooking up the trailer fast and effortless. Also, at overnight stops on the road, it's much easier and more convenient to disconnect the trailer (we used to just drag it around with us when going to dinner or shopping).
In all, this power jack is a great convenience, and worth every penny we paid.
TIP: To protect the powerhead from sun and moisture, we cut one end off of a used, large, rubber marine fender (boat bumper) and secured it over the top of the jack with a long bungee cord. As a result, the powerhead looks new after several seasons.