It's been my observation that moving the sled from point A to B is easy. Point C is another matter. Most sleds, the way they are set up, the pulling vehicle can sucessfully lift the pan off the track, or at least greatly reduce it's friction during the initial part of the pull. This gets you at least to the first 100' mark. Once the weight box passes the sled wheels and the pan drops, that is where point B is reached. Most any gear combination with any speed with get you there. What differentiates people who make it past point B is inertia, wheel speed, torque, and luck. Once that pan drops, everybody stops. The only difference is how far the sled itself will slide from its own weight based on its forward momentum. This is why wheel speed is so important once the tires lock into the track. You've got to get that sled moving fast enough so that you can essentially throw it like a medicine ball. In my mind, the most important thing about pulling is doing it and being able to drive away with your dignity. Breaking, while always a crowd pleaser, leaves little room for consolation when applause or laughter replaces a distance number as the memorable achievement.