Truck and Tractor pulling, also known as power pulling, is a motorsport competition, which requires modiefied tractors to pull a heavy sledge (sled) along a 35 Foot wide and length of 100 meter or 300 ft + track; with the winner being the tractor that pulls the sled farthest.
The sport is known as the world's most powerful motorsport, due to the multi-engine modiefied tractor pullers.
The sled is known as a weight transfer sled. This means that it is pulled down the track, the weight is transferred (linked with gears to the slefg's whells) from over the rear axles and towards the front of the sledge. In front of the real wheels, there is a 'pan'. This is essential a metal plate and as the weight moves over this the resistance builds. The further the tractor pulls the sledge, the harder it gets.