Shows how much I check my own threads.
Anyways, for redline_r - I have mechatronic issues from my DSG from the time to time. Primarily, it won't go into reverse unless I shift to park, shut off the car, restart, and then go back to reverse. But my 2010 JSW also has 250K on it, and I've mostly replaced it by my 2013 CPO JSW with a 02Q.
That being said, I've never had any problems while actually towing, and the most I've towed was about 4500 pounds, though I didn't take the car over 60mph (and I think I was in 4th or 5th). The gearing ratio is a lot different on the 02Q than DSG.
On a mk6 vehicle (and possibly a mk5), you do need the towing electronics to get a brake controller to work. Believe me, a brake controller makes a world of difference. Plus you really do need lighting to be legal.
I picked up a Westphalia 13 pin Euro controller from PF Jones. Not cheap, and I had help on the first time it was installed. After I swapped it to the 2013, it made more sense. It was like 3 or 4 wires that connected directly to the BCM, the module goes on the left hand rear side of the car (on my wagon, anyways), you add module 69 - Trailer to CAN gateway in VCDS, and that's pretty much it, aside from adapting the appropriate wires to your 7 pin round connector (mine is a combo 7 pin round/4 pin flat, though I only own like 3 trailers that have 4 pin flat connectors).
Fuel economy takes a hit. Expect 23-30mpg, depending on speed and payload. With a teardrop trailer, I wouldn't keep your hopes up in getting anywhere near 30mpg, unless you were going under 50mph.