Basically NASCAR’s tire changers work out to two per axle, since they only change tires on one side at a time. And the fact that they have to slide a floor jack under the car, change tires, let it off the jack, then run around the car and repeat the process makes their pit stop times look pretty amazing.
Yup. I have one of those easy-up jacks, and it takes me more than 8 seconds just to get it in the right spot before jacking. Then there's the dumping of the lug nuts into the snow, and the f-dash-dash-dash, and my wife washing my mouth out with soap...