Naturally, the Sierra HD family of pickup trucks are the most capable vehicles on the GMC lineup. That continues in the new versions, but let’s highlight some of the most impressive capabilities in the new models. The 2500HD can accommodate up to 22,500 pounds, which is an increase of more than 4,000 pounds compared to its predecessor, and the Crew Cab model can trailer up to 21,900 lbs. itself. As for the 3500HD, it can trailer up to 36,000 lbs. This is thanks in large part to the available 6.6L Duramax Turbo-Diesel V8, which is capable of generating up to 470 horsepower alongside 975 pound-feet of torque.