This is an impressive video of not only the Airstream's handling ability but also the T-reg's towing ability.
A quick search of another RV towing forum revealed some interesting comments from a couple 2003 posts. Interesting how time can change things.
QUOTE: I stopped by the dealer and looked at the Touareg, just looked. There is no way that vehicle could safely tow more than a 21 footer. The wheelbase is too short.QUOTE:
QUOTE:Very unlikey a Tourareg could control a trailer that big and heavy in an emergency situation. QUOTE:
QUOTE: I would be very careful about what you tow with that vehicle. QUOTE:
Airstreams..... The best towing trailers on the planet!