Greg Martin of Platinum Chevrolet Commercial Trucks in Santa Rosa CA talks about the 9' Harbor Service Body or Utility Body mounted on a 3500HD dual rear wheel chassis. This unit has 22" deep compartments to be able to carry larger tools and equipment along with greater weight because of the dual rear wheel setup.
This body also has stainless steel open top lids, a heavy duty forklift loadable tapered leg rack with outside mount for maximum width, a class IV receiver hitch and more. This is a heavy duty work truck, but still has what in the past would have been called an uplevel interior, but now standard. It is a work truck you will love to drive and it has a similar turning radius and maneuverability of an 8' standard pickup truck.
See more at http://PlatinumChevyTruck.net