That includes the GMC AT4 sub-brand, which is available across almost the entirety of Big Red’s lineup. The question, then, is this – what does AT4 actually stand for? As it turns out ...
The 2019 GMC Sierra AT4 proves that GM's upmarket truck and SUV brand is getting serious about offering rough-and-tumble capability to rival the Ford F-150, Toyota Tundra, Ram 1500 and Nissan Titan.
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