2015 GMC Sierra 2500HD Denali and All Terrain Make the (Professional) Grade
GMC has been building trucks since 1902 and they are built under the mantra of “Professional Grade.” I recently tested a couple of the brand’s latest 2500HD models in the form of the Sierra Denali and All Terrain. This new crop of 2015 GMC Sierras is the most comfortable, most capable and most advanced GMCs yet, truly professional grade.