For 2025, the GMC Sierra 1500 full-size pickup continues to offer its special AT4X model designed for off-road enthusiasts. Introduced three years ago, GMC called the Sierra AT4X “the new peak in ...

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The GMC Sierra AT4X enjoys designation as the pinnacle of the Sierra off-road pickup truck lineup, offering enhanced capability, as well as a wealth of rugged design elements to help it stand out from ...