You get better traction because the bulk of the weight in the vehicle is over the front tires. That's why 2wd Pickup trucks put weights over their rear axle in their beds to help with traction when driving on snowy roads, otherwise the rear instead of moving forward wants to move sideways.
The only time you may get a slight advantage is when you are stationary and you're trying to accelerate on a slippery surface (in a straight line only). That is when the weight helps you out.
The moment you are in motion and taking a corner you are accelerating with the same tires you are steering with therefore you're actually making it lose traction quicker. Not to even mention if you happen to be breaking... very easy to overload the front tires and lose all control.
Most cars these days (excluding pickup trucks) have a pretty balanced weight distribution and so steering with one set of tires and accelerating with the other is an advantage.
I'd draw a few free body diagrams for you guys but I don't have a way of scanning them.
![[Geek]](graemlins/geek.gif)
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