What makes it capable is the hydropneumatic suspension. As can be seen in the photo below, the package sits dead level. As the suspension is active, this means that as the load changes through driving conditions (corners, etc), so does the suspension on the car to keep the whole thing level. If a corner goes down through cornering dynamics, the suspension pumps that corner up, and drops the opposite one down a bit. When we get over 100kph, the whole car drops two inches to improve the airflow characteristics over the car.
Add to that the features that ALL tow vehilces should have; Electronic Stability Program; Electronic Brake Force Distribtuion; ABS; and Emergency Brake Assist (this one is really neat. If you suddenly apply the brake pedal, a sensor reads the speed of pedal travel and if it is over a value that indicates an emergency stop, it applies maximum braking force); and you have a car that does very well in the towing stakes.
The downsides are that you have to know your ramp. Normal ones are fine, but steep ones are out. You also can't take the 'Scenic Mountain Route' as the vehicle is limited to 8 degree slopes with the Mac's weight.
Why go to that trouble? I had a medium sized 4x4 for my last boat, and whilst they are wonderfully capable at the boat towing lark as far as pulling and weight authority on the road is concerned, they are a bloody pest to drive for the rest of the time. I want to be driving a nice comfy car to work and back. Not the 'Wagon Queen Family Truckster'!
PS - The name has since been changed
