This is the 2500HD Regular Cab (also available in Extended Cab and Crew Cab) with an 8' Service or Utility body. It is shown by Greg Martin, Commercial Truck Manager at Platinum Chevrolet in Santa Rosa, CA, the 2500HD is the most popular commercial truck he sells.
This particular unit is a 2012 model with the 6.0 gas engine. The body shown is a Harbor TradeMaster Service Body with a Tapered Leg Forklift Loadable Rack, and a Class IV Receiver. Harbor Truck Bodies is famous for their standard Stainless Steel open top lids on their service bodies. See more about these trucks at http://www.PlatinumChevyTruck.NET, or call Greg at 707-525-1800 for more information.