4WD and Cco/Lgt Cash Perf. Diesel! Turbocharged! Don't pay too much for the fantastic-looking truck you want...Come on down and take a look at this terrific 2012 GMC Sierra 2500HD. Visibility from the driver's seat is especially important when piloting a truck of this size, and this 2500HD Denali provides commanding views ahead, yet still allows you to see all the lower-riding cars around you.