In their pulling configuration probably meh. I dont know about the heavy modifieds, but I believe unlimited superstock tractors have a wheelspeed of around 150-170km/h, and guessing heavy modifieds are about the same. But I honestly wonder about this question often, just for the fun of it
"Sled Reset" is when they make a change to the weight transfer machine (pulling sled). They do this is they think the sled is too light or too heavy. So if the puller has a decent pass but ends up way short. They will probably lighten up the sled and the puller will come back. There are several adjustments they can make. Here is a video that explains the basics of a pulling sled. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-J9SzYpgQJto.html
Why the shut offs after the runs every event before this they back up the idle away!!!! Wired to shut off don't even give the engines time to cool off after the run. !