I used a VW Rabbit GTI - 1.8L 4 cylinder - to tow my NACRA5.2 and lots of camping gear for several years. Lots of pep, no problem pulling. For a while I had a 4x4 S-10 Blazer - 2.8L V-6. It did not have good power, but braking , storage and lakeside traction were much better.
I really believe the Rabbit GTI with trailer could beat the empty Blazer in a 1/4 mile drag race (dry pavement).

Currently, I tow my N5.5uni, with a Chrysler Sebring convertible (2.7L V6) - unless my wife lets me have the Tahoe for the weekend. It handles nicely, but I notice a lot more brake dust on the wheels than normal.

I would think the VW Passat wagon with V6 would be a very capable catamaran tow package. But if you really like VW, what about the Touareg? TV ads show it pulling an Airstream trailer!