True story - Late 80's or early 90's - Insurance company noticed that there were far more rollovers happening. They look into it and find that it's just pickup trucks rolling over more. Look into it further, and it's just GM/Chevys. And the amount of rollovers jumps once it hits a specific year, a year they did a redesign of their trucks. Insurance company buys new and old GM trucks. Purposely roll them to find out why the new ones are more likely to roll over than the old ones. Finally they figured out why the new trucks roll over more. When they redesigned the trucks, yes they redesigned the body of the truck. But they also redesigned the heat/AC controls. So those old farmers would be driving down the gravel roads and have to take their eyes off the road to adjust the heat. They'd accidentally steer out of the ruts onto the loose gravel, lose control, dip into the ditch, and roll. They spent millions, totalled a bunch of trucks, and took a year or two to figure it out.