I heard it works four times as fast in a 4x4.
From the submitter:
On the first day of a 3-day trip, I rear-ended this rental car into another car. Instead of trying to find a replacement rental on the 4th of July weekend, I (with the help of the local police!) "fixed" the bumper that was hanging off the car. I then drove it another 400 miles before returning it to the rental place on the 3rd day. I had to stop every once in a while to tighten the wires. It was nerve wrecking!