Date registered: Jun 2013
Vehicle: 2003 CLK320 (A208) in Triple Black
Location: Atlanta, GA
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Don't even try it. The Airstream, unless it is very old and/or has been stripped of all it's insides, will come in at more than 5000 lbs. dry weight. Even if it really is 4000 lbs., that would tax any 20 year old car. I could not find the tow rating of the E320, but I doubt that it exceeds 3000 lbs.and is probably less.
A smaller Airstream, a Bambi for example, might be doable.
If you have both the MBZ and the Airstream, be aware that the Airstream is probably worth more (maybe considerably more) than the car.