Here is a post I found on Airstream website:
rip Report - Towing 28 foot international with TDI
We just finished a two week trip from Dallas, Texas to Canada crossing through Montana, Wyoming, and Colorado (Glacier, Yellowstone & Grand Teton Parks) on the return and the performance was, in a word: AWESOME.
The airstream was reasonably loaded with gear, food, and fresh water and the Touareg also carried twin honda 2000 generators in a Rhino Rack roof basket. The TDI put out more than enough torque to handle 8% grade ascents and decents on US89 for miles without hesitation and at a decent speed. (Easily maintained uphill speeds near the summit at 65mph with 2800 rpm after a 2-mile climb). All this and I averaged 15mph towing a full load.
My 2010 TDI is equipped:
3.6L TDI engine
20" high performance, low profile wheels with big disc brakes at all four corners.
Factory Tow Package
ProPride P3 Hitch 1000# weight distribution bars
Hitch receiver reinforcement (welded bar support from receiver box to rear suspension structure) courtesy of Can-Am in London, Ontario.
Tenkonsha P3 Brake Controller (set to Large Trailer and boost at 8.0)
I am happy with my set up and thankful to everyone on here who provided wisdom and positive encouragement.
The rig stops straight and quickly, (even in emergency situations) is incredibly manuverable thanks to the ProPride Hitch, very stable at all speeds and on all road conditions (rough, windy, rainy, uphill, downhill), and a pleasure to drive with and without the A/S in tow. There were no "white knuckle" moments and 50 mph cross winds had little effect. For me (and my set up is NOT for everyone), I get the trailer I want and a great daily driving vehicle.
That said, I did my homework and paid to have my rig properly configured without cutting corners. Great trip, great adventure! And we're home safe and sound.