The 2020 GMC Sierra HD Is A Monstrous High-Tech Workhorse“This truck is capable of towing 35,500 pounds. That’s about half of what a semi truck can haul,” emphasized GMC Executive Chief Engineer Tim Herrick. He was referring to the top-spec 2020 GMC Sierra HD 3500 dually, with a 6.6-liter Duramax turbodiesel V8 and Allison 10-speed. Even without the headline-grabbing 1,000…
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The 2020 GMC Sierra HD Is A Monstrous High-Tech Workhorse**********
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