I hope this answers some of the questions of how does the non air suspension Touareg tows. My answer is certainly as well as my Yukon, but with more efficiency, which was my expectation. That's as good as you're going to get short of the big pick-up specialized tow vehicles.
Particulars are ground to center of receiver unloaded 16". Ground to center of receiver with boat 14 3/4". A 1 1/4" spring sag is negligible.
Boat weight 2900 lbs. Trailer weight 824. Motor 591. Fuel weight 400 lbs, which on my boat is carried forward of midships. Boat is 23'. I have no idea what my tongue weight is.
I tow one 2,000 mile trip each year and today was just a short trip to see how the truck did. I'm very pleased.