2007 Silverado vs. 2007 GMC Sierra vs. 2007 Dodge Ram vs. 2007 Ford F-150 vs.TundraGM recently invited us to their GMC Sierra/Chevy Silverado Truck Challenge, where we got a chance to drive the Sierra and Silverado back to back with their main competition, including the Dodge Ram, Ford F-150 and Toyota Tundra. Although it didn't reflect the real working conditions of these trucks, it offered an excellent opportunity to discover each truck's unique character and how they perform differently under similar conditions. While there was no off-roading component, there was a demonstration of the Eaton locking differential that comes standard on all GM trucks, whether configured in 2WD or 4WD. Other components of the Challenge included towing, a stability control test and then a handling and braking test. While the GMC/Chevy Challenge doesn't measure up to the Truck King Challenge in terms of thoroughness or realistic work conditions, it was far simpler and clearer with trucks that fairly represent most companies' volume models (excluded was the Nissan Titan because it doesn't sell in the same volumes as any of the others).