I once had a Superb Greenline as a company vehicle. I had a Witter towbar fitted and towed a caravan. Because the Greenline had lowered suspension it was a nightmare to tow with. Whenever hooking up the caravan the jockey wheel always got stuck. (the jockey wheel was as low as it would go before the"van was hooked on)
I checked tow ball height and found it very low, something like 320mm even without anything hooked on. I took it back to the company who fitted it and to say they wern't interested is an understatement! (think there is a thread on here about it somewhere)
I eventually had a different towbar fitted and that was fine.
Just be wary of towing with a lowered vehicle.