2015 GMC Sierra 3500 takes on the new Ike Gauntlet HD Extreme Towing Test

( ) The 2015 GMC Sierra Denali 3500 is the new Heavy Duty diesel truck from GM that's about to take on the Ram and Ford HD trucks on America's Highways. With the trusted GM Duramax diesel, this new truck is built to tow. In a brand new Ike Gauntlet HD extreme towing test, we see just how well it handles America's highest and steepest highway towing over 15,000 pounds. The Ike Gauntlet HD is a timed run up one of America's steepest highways from 9,000 feet above sea level to t