Using a Nimbus 3 in a Pfeiffer trailer for reference, towed behind:
00 Subaru 2.5L Outback (stick)
96 Chevrolet Tahoe 5.7L (auto)
97 Holden Commodore 3.0L (auto)
Before the trailer had functioning brakes, the Subaru was useless to stop it, hence the Tahoe purchase.
After installing trailer brakes, got rid of the Tahoe. Most of the horsepower/fuel was used to lug its own weight around anyway.
The Holden did pretty well, but the best trailer handling of the N3 and also the heavy and long Cobra ASH26E trailer was behind the Outback. Even handled X-wind, passing large vehicles, everything but starting up a hill, better than the Tahoe. Handled towing in high temperatures better than the Holden. Probably due to the RPM the water pump was turning!
However... Eventually replaced the Subaru's clutch, then had to replace the viscous coupler in the AWD at about 120k miles. Both seem weak links. Note that newer Subarus with 3.0L automatic still have the same viscous coupler.
Currently towing with Toyota RAV4 3.0L (auto) FWD. It has plenty of power, and will pass other vehicles at a vast rate of knots even when towing a Cobra trailer with ASW27. A friend proved the 4-cylinder RAV4 is adequate. Front Wheel Drive seems pretty silly to me, it should have AWD.
Thinking if the Audi Allroad 2.0 TDI had a reasonable maintenance record, it would be a great tow and everything else vehicle. This year Audi put the 2.0TDI in the N. American A3 FWD. Be years before the A3 Quattro or Allroad get it.
Jim