I just got back from an 2800km iceboating trip where we were towing 2 DNs in a small, aerodynamic, enclosed trailer with a friend's 2001(?) TDI Golf. The trailer didn't weigh more than about 1000lbs, so stopping wasn't an issue. The real point relates to earlier criticisms of VW reliability. This is this fellow's second TDI Golf. He put half a million km on the first one and the current one recently passed 450,000 km. No reliability issues there.
But I share the common dissatisfaction with downgraded tow ratings, and preference for trailers with electric brakes. It's no fun running down a long downgrade with a moderately heavy tow if you can't stab the trailer brake alone to keep the car and trailer in the correct order. :-)