GMC Sierra 2500/3500 | 20,000 pounds
GMC’s big dog truck, the Sierra HD is all new for 2020. It’s also offered in three-quarter-ton 2500 and one-ton 3500 configurations powered by GM’s 6.6-liter Duramax diesel. The turbocharged V-8, which makes 445 horsepower and a behemoth 910 lb-ft of torque, is backed by an Allison 10-speed automatic transmission and can pull considerably more weight than its 401 horsepower 6.6-liter naturally aspirated gas V-8. With that engine, the 2500 model can tow a maximum of 14,500 pounds, but that number jumps to 18,500 pounds with the diesel. The 3500 can yank around up to 16,800 pounds with the gas engine and 20,000 with the diesel. Like the Chevy, the GMC’s numbers climb when you start talking about fifth-wheel or gooseneck trailers, with the 3500’s capacity maxing out at 35,500 pounds.