I have a Nissan Armada today which I tow my boat which is 4,000 lbs.

I am looking at a 2011, 2012 Q7 for towing. Based on my research I see folks having good response to using the Q7 TDI with air suspension.

I am curious what other people recommend?

Does it have to be the TDI model or would a different model work as long as it has the towing option?