Anyone who owns a race car knows that one of the hardest parts of racing is getting the car to the track. Unless you live around the corner from the venue where you'll be racing, you probably don't want to put wear and tear on your expensive race car by driving to a race. You can't simply get inside the car, step on the accelerator and head to the track. You need some other means of transporting it.
This article from Christopher Lampton sheds a light on towing race cars.