Spied: 2020 GMC Sierra 2500 HD Single Cab Upscale Hauler by Sebastien Bell May 16, 2018 Share Comments It looks like GMC will be adding another variation to the lineup with a single cab 2500 HD Denali. The truck looks to be following the luxurious path set by its little sister, the Denali 1500. Although there isn’t much to see in the way of exterior trim pieces, our photographers did catch a glimpse of what appeared to be the word “Denali” embroidered on the truck’s leather headrests. Previous ImageNext ImagePreviousNextView Large Along with GMC’s recent upscale march, it would make sense for the brand to introduce a heavy duty truck for the wheel heeled hauler. Expected to utilize steel and aluminum construction, again like the 1500, the Denali HD is expected to truck along thanks to a 6.0-liter V8 standard. A 6.6-liter Duramax V8 is also expected to continue as an option.