Imndeep, you got me motivated to look at the airstream site. I would think a 16' airstream bambi, approx. 3500 lbs/350 lb tongue weight, may exemplify your sweet spot. See this guy's post on pulling with a wrangler with a WD hitch -
New 2015 16' Sport, towed by Jeep Wrangler Unlimited - Airstream Forums

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2006 X5 3.0 6-spd w/Evo UUC ssk
sport/premium pkgs
born Valentine's Day, 2006.