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Differences between the GMC Denali and AT4 Trim Levels Photo: GMC We’ve all seen those signature badges adorning GMC vehicles but what do they signify? The Denali and AT4 trim levels are two of GMC’s sub-brands offered across the model lineup, and they each come with a distinct set of features. Here’s a look at their differences. Denali Photo: GMC Denali models are all about upscale style and luxury. This range-topping trim features leather upholstery, signature seat trims, aluminum accents, and contrast stitching, which serve to make Denali interiors distinct from other trims. They’re also unique thanks to standard comfort features like heated front seats and additional road-noise-blocking insulation. In addition to these comforts, Denali models also offer the most standard driver-assist tools. For instance, the GMC Sierra 1500 Denali comes standard with Front and Rear Park Assist, Lane Change Alert with Side Blind Zone Alert, Rear Cross-Traffic Aler ....