General Motors had probably brought out this trim level on their Heavier-Duty pickup trucks to compete with the revived Power Wagon name on Dodge/Ram’s Heavier-Duty pickup trucks.

We are not interested in neither GM or Dodge/RAM’s off-road oriented trim levels on our own Heavier-Duty pickup that we will use to tow our Fifth-Wheel RV trailer.

GMC today introduced the 2017 Sierra HD All Terrain X, the most off-road-capable model in the Sierra HD lineup, and one that matches its enhanced capability with trail-ready style and the brand’s signature refinement.

Source: GMC Introduces Sierra HD All Terrain X