Last thing I towed was the back end of a BT van made into a trailer.
With the wheels near the back there is a heck of a lot of weight on the hitch but I have to say it pulled like the trailer didn't exist.
I guess the height and width of the car also help a great deal with stability (and the BT trailer has an inbuillt wind deflector which seems to marry up perfectly with the roof of the doblo.