If you watch, allot of the tractors had weights hanging back by the rear tires, they basically try to get the front tires picked up off the ground so that all of the weight is on the rears but not so high it goes onto the wheelie bars. They run similar stuff at the fairs around here, it doesn't matter if it's a soft or hard track the front end is usually going to be in the air. Plus those tracotrs are close to 8,000 lbs, with that big of a tire they are going to get some serious traction.