The Chevrolet Silverado 3500 won our Rumble in the Rockies competition, but technical superiority doesn’t always translate into sales leadership. That’s precisely the case here, as the Ford Super Duty still reigns supreme in the heavy-duty truck segment. The 2011 F-Series Super Duty makes up half of the total market, with Chevrolet, GMC and Ram making up the rest. For more analysis on this sales trend, continue reading at PickupTrucks.com. Also check out our top stories from Ask.cars.com and MotherProof.com.