Very good!
But I disagree that it has anything to do with the drivetraine being symetrical!
More likely that the Scoobt traction control operaters the brakes on slipping wheels hense affectfully making limited slip diff!
So if the driven wheel on the right is being resisted by brakes then the driven wheel on the left will turn as it has resistance and propel the car up the ramp!
Silly Americans!
The VW passat was impressive, It had the quickest transfer of power the the rear of all the electronicly controlled AWD systems,
The Leggy more than likely has genuine all time mechanic AWD not electronical actuated!
Dan
PS, Good thread!