A cayenne turbo would be my ideal tow car, or a chipped V10 Diesel toerag.
Back down to earth if it s a pure tow slag then a Big 4x4 but not a ropey old Tdi, has to have soem grunt so something like a V8 Disco, if its to be used everyday then as much torque as possible, 1.3tonnes is way to low btw, a decent trailer will weigh circa a ton, plus the car and you will in terms of the law be towing illegally!
I know i am every time i use the audi!