Tractor pulling and "work" pulling are two completely different things. With tractor pulling you don't want to waste HP trying to getc the weight rolling, and wheel speed is important. Plus, like Don pointed out, the weight isn't movable.
When doing tillage work at slow speeds, we don't care what it takes to get it rolling.... it's not a race. You need the weight directly on the tire because your trying to gain traction. Bouncing around in a field/garden, you want as much weight on the wheel itself so the axle bearings don't have to absorb the abuse.
Very, very different applications.
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