Hello all :) A "pulling sled" is a vehicle used in Truck/Tractor pulls. The "sled" as it is called has a heavy weight attached to its frame on a moving track. As a truck pulls it down the track. The weight gradually moves forward, putting extra weight on the dragging front end, and adding more resistance, to the truck pulling bogs down, or manages to do a "full pull" (go all the way down the track) The sled has a cab in back for the operator which controls the weight, and has folding wheels in the front, which allows it. To drive its self back to the starting line.

as seen here

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