Some interesting information about racing trucks:
Truck racing is a form of motor racing which involves modified versions of heavy tractor units on racing circuits.
The trucks used in the beginning were actually working trucks with tandem rear axles and used street tires yet still attained speeds of 150 mph (241 km/h).
There is off-road trucks, they have more than 1000 hp motors.
Maximum race speed is restricted to 160 km/h (100 mph) for safety reasons, and a minimum weight limit is 5500 kg. Races start from a rolling start, and commonly races last from 8 to 12 laps. Although a non contact sport, due to the physical size, and closeness of trucks to one another during races, minor collisions can often occur. However, injuries to drivers are very rare.
Unlike other forms of motor sport, race trucks look like their road-going counterparts and conform to regulations to ensure that major components used are the same.