The Sierra 3500HD is the largest, strongest GMC truck you can buy, standing above the 2500HD, Sierra 1500, Canyon, and the upcoming Hummer EV. It was fully redesigned last year and adds a healthy ...

Like its predecessor, the 2020 GMC Sierra 2500HD is available in base, SLE, SLT, and Denali trims, but it also adds a new, off-road-optimized AT4 grade as well. AT4 adds trim-specific Rancho ...