One thing to watch with the Audis as tow cars is the rear springs. I've broken a couple of coil springs over the years so something to be aware of.
I've got an (2001) A4 quattro avant sport (2.5 TDI V6). The sport sits 20mm lower than stock, and the newer S line models are 30mm lower. I've towed a Zodiac Pro and Ribcraft 4.8m, so not particularly heavy loads. Probably over-loaded at holidays, as the A4 avant boot space is poor compared to the Passat in terms of load space.
Is that with or without VAT?