This is by far the best picture of the power challenge. Perfect camera settings. A 9 from (10 if the tires were darker, especially the front tire)
Blue or red ribbon
Unfortunately you either took the photo to close or cropped to close. This photo really needs a bit more behind the truck and good amount of empty space in front for it to head into. It is just way to cramped for my taste. Other then compositional taste, the rest of the photograph is magnificent.