Just like the Chevrolet Silverado, the GMC Sierra 1500 is a versatile full-size pickup that caters to a wide array of customers with numerous models, trim levels and powertrain options. Unlike Ford and Ram, the company still offers a six-cylinder diesel engine. The cabin, meanwhile, is dressed to impress, especially in top-line Denali Ultimate trim. When it comes to off-road driving, the AT4 and AT4X models have you covered.