2019 GMC Sierra AT4 review

At the start of the day theĀ trucksĀ are spotless, their 18-inch wheels, dark-finish exterior trim and red tow hooks on prominent display. A couple of hours later they’re filthy, splattered with dirt and dripping muddy water. That is, after all, exactly how the 2019 GMC Sierra AT4 is meant to be used. It’s a package designed for Sierra buyers who plan to take their truck off-roading, and a romp around the trails at Eaton’s proving grounds in Marshall, Michigan, reveals that the AT4 is more than up to the task.

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