GMC Sierra HD (2020)

Like its Silverado cousin, the Sierra HD is all-new for 2020 in both 2500 and 3500 form, with two trims and two box lengths for each at the moment, with more likely to follow. Two powertrains are available, a standard 6.6L V8 paired with a 6-speed automatic and an optional 6.6L Duramax diesel V8 paired with a 10-speed automatic. Maximum payload is 7,442 lb. while max towing is now a whopping 35,500 lb.