No one buys station wagons in the US unless it's a Dodge Magnum and even then they don't sell to well because they are station wagons. I personally would never buy an Audi because I'm getting an expensive car that will not pull my trailer.
But lets looks shall we?
Audi A6 built the way I like would run $50,890...I opted for the Premium package and the heated amenities, along with the power lift gate. Not over the top but some nice touches. It comes with a 3.2L V6 with 255hp and the 6 speed triptronic. However I could not find a towing package, nor could I find anywhere on audiusa.com where the tow rating for the A6 Advant was.
A Chevy Tahoe LTZ 4x4 when built the way I liked ran $48,055 and I got everything except DVD nav because I see no use for it. But I got the 20 inch rims, sun roof, 4.10 rear end, towing package, power lift gate, leather interior, Bose sound system, among other things. Not only was the Tahoe cheaper and had more stuff, more power, it could tow 8,200 lbs. That's a lot of weight and makes my boat look like nothing.
There for I see the Tahoe as the better buy here.