The All Terrain HD concept develops the off-road ability of the heavy duty version of the latest GMC Sierra. Built atop the fully-boxed 2500 HD chassis, the concept features a unique short bed/crew cab body configuration, which is 229mm shorter in length and 102mm wider than production Sierra HD models.
Created by Mike Gillam and Matt McNerney under the direction of former Hummer design director Carl Zipfel, the exterior is a purposeful design whose form clearly follows function. Sections have been taken out of the lower corners of the front and rear fenders to create a 39 degree approach and 31 degree departure angles, which give the model more off-road prowess, and full composite protection was also designed for the underbody. "It plays off from where the Granite was going," McNerney told CDN, "[Its] stalwart but dignified at the same time – a bodybuilder in a nice suit."
Finished in ‘iridium metallic' – a color named after the toughest metal and reserved solely for the GMC brand – the vehicle's functional elements are highlighted in a contrasting anodized dark satin hue. At the front, the design flows upward from the skidplate to create a dynamic graphic for the grille, while its clearance lamps have been integrated into the blackout surround of the front screen and backlight for a cleaner appearance. Vertical themes in the tailgate also add to the masculine character and subdued elegance that personify the GMC brand.
The four-door crew cab has been carried over from the stock truck and equipped with motorized assist steps, which are deployed when the door is opened, easing access into a cabin that stands approximately 76mm taller than in the standard version. The concept's interior – thoroughly modified by interior and color and trim designer Gulya Kuldjanov (who also worked on the Granite concept unveiled last year) – is adorned with stainless steel mesh and aluminum details – precision materials which speak to the functionality and durability of GMC. The leather-wrapped door panels and two-tone soft stamped leather seats embossed with a carbon-fiber weave add a luxurious and technical touch to the cabin, reinforced by the bedliner's circuit board design theme, which has been transferred to the floormats.