Last year, we found a lot to like about the 2019 GMC Sierra 1500 AT4. Equipped with a brawny 6.2L V-8 and 10-speed automatic, it featured excellent styling, Olympic-sprinter reflexes, and a cushy highway ride. However, it was let down by a relative paucity of luxury features and uncontrolled suspension motions off-road. Well, we’re happy

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