2017 GMC Sierra HD: The 2017 GMC Sierra HD is the heavy-duty version of the brand's full-size pickup truck, and it competes with the Ford F-250 and Ram 2500. For this year, it gains more power from its available diesel engine. The truck is available in regular, double, and crew cab models. A high-end Denali version is available.The Sierra HD is powered by a 6.0-liter V8 that makes 360 horsepower or a 6.6-liter turbocharged diesel engine that makes 445 horsepower. It's available with two-wheel or all-wheel drive. Both engines pair to a six-speed automatic transmission.Key available features include wireless device charging, remote-locking tailgate, infotainment system, Apple CarPlay, Android Auto, HD radio, navigation system, in-car wireless, Bluetooth, and USB.Available safety features include lane-departure warning, forward-collision alert, front and rear park assist, and dual-front, front-side and side-curtain airbags.