I willing to bet both cars had 4-link suspensions on them and once the tires break loose, it's over with; as it is in Pro Stock. I don't know the situation, but how many cars went down the track prior to these two without issues?
Drivers and car owners always have the right to say no, I am not running my car down this track. We've done it after the car in front of us barrel rolled 11 times at the March Meet one year and made it on national television.
http://www.rodauthority.com/news/vi...coupe-crashes-and-barrel-rolls-down-the-trac/
A spring was leaking up from under the track, but you couldn't see it on the surface except for a couple of weeping spots. Compounded by the fact that they had ran Top Fuel in front of us and they had no issues.