They will roll a bit more perhaps as they sit slightly higher on their springs. They will also be slightly slower off the mark with the weight of an extra diff propshaft and transfer box- set against that will be better traction and cornering with 4 WD. I used to know a Mercedes salesman who took one on the special stages of the Inverness Snowman rally--- in the days when sales guys were motoring enthusiasts--- still a few around thankfully! Mercedes took great pains to make them drive in a very similar fashion to the RWD drive cars