We've towed with our V8 with no problems. Mind you we don't tow every week.. .and we don't tow long distances.
It will take the wieght no problem, milage won't be the best..but it's a trade-off..
Please e-mail me if you want more details..
Also your better off doing a search in the Touareg Forum on
www.vwvortex.com for input as may tow large enclosed camper trailers and put the trucks to their limits.