The professional sleds will not stop a 50,000 lb 4wd or track tractor, so it's not going to be much of a contest. The sled is going to have to weigh more then can be legally pulled around in one piece to be effective against machines the weight of a modern tillage tractor.

Today's tractor pulling has nothing to do with tractor pulling. Since nobody uses a progressive sled anymore, it is nothing more then a race, plain and simple. With the racing sleds, whoever can get the sled going the fastest before the pan drops will win. 'Course, the farm tractor mentioned above is the exception, because it will make so much more drawbar pull then the pulling tractors that it exceeds what the sled is designed to stop....pan drops, tractor just leans into it a little, shifts down a couple gears, and keeps going....looking back and saying "I can do this all day" The local National Guard brought a HEMTT to a pull I attended once.....pretty much the same story, pan dropped, the allison grabbed a gear, the 8 Michelins squatted and slipped slightly, the Detroit bellered, and it proceeded to just keep going. The HEMTT most likely weighed more then the sled, so it wasn't much of a contest, it was going to keep rolling until something got in it's way.