If any of you watched the Top Gear: Polar Special, you will know that they used a special "bungee" strap to pull their stuck Toyota Hilux out of snow/ocean slush. It took a couple of attempts, but they said it was a very gentle way to "yank" someone out of the snow. Hook up this long bungee cord, get a running start, stretch to the limit, then stop and wait for the other vehicle to snap back. Sounds good to me.