The GMC Sierra HD is loaded with features that make this work truck perfect for performing any task, and venturing where most trucks are afraid to go. An example of such feature is the world’s first six-way MultiPro tailgate. An inner tailgate opens and folds several ways to enable six functional positions which adds two different load stops, a work surface, plus a full-width step. Or the inner gate can simply fold all the way down and get out of the way, letting you stand a few inches closer to the bed. The feature I enjoyed the most was the towing and trailer technology. The ProGrade Trailering System aims to make towing simpler, and is standard on the Denali. This technology adds intelligence in the towing experience through In-Vehicle Trailering App, plus a companion smartphone app called myGMC that keeps the system at your fingertips even when away from the …