The all-new 2020 Chevrolet Silverado HD and 2020 GMC Sierra HD were unveiled earlier this year with impressive towing and torque figures, but that hasn't stopped General Motors from updating the heavy duty pickups with even more improvements for the 2021 model year.

Inside sources have told GM Authority that the 2021 model year updates will focus on various in-vehicle technology features that are currently offered with the heavy-duty pickup models. According to the source, one of the main improvements will be updates for the software and trailering camera systems, which were already upgraded in the new generation models for the 2020 model year.

Both the Chevrolet Silverado HD and GMC Sierra HD have trailer systems with up to 15 unique camera views to monitor space around the truck offering angles immediately ahead of the pickup, to the sides, behind the bed, around the hitch, inside the bed, and behind the trailer, along with several top-down views and many others.

As with most model updates, the 2021 Chevrolet Silverado HD and 2021 GMC Sierra HD pickups will launch in summer 2020 and will be the second model of the current generation of HD pickups from Chevrolet and GMC. Despite the mixed reactions to the 2020 Chevrolet Silverado's gigantic grille, the heavy-duty trucks aren't expected to receive any significant styling changes for the 2021 model year.

Clearly, the bold styling changes haven't affected sales, as GM Authority notes that the 2020 Silverado HD made up 40 percent of Chevrolet Silverado HD sales last month. This perhaps isn't surprising since the 2020 Silverado HD starts at $35,695 including the $1,595 destination charge, which is $300 less than last year's Silverado 2500HD. The 2020 GMC Sierra HD, on the other hand, is more expensive than its predecessor, with a starting price of $37,195.