It used to be that heavy duty pick-up trucks were the work horses of the Chevy fleet. These were brawny trucks used by brawny men to do brawny jobs. But that's changing fast as more and more recreational buyers are getting these big pick-ups to haul big campers, horses and boats. For 2011 Chevrolet redesigned the Silverado 2500 HD to make it even more brawny with a sturdier frame for more towing capacity. Recently we had the chance to spend a week with the 2011 Silverado 2500 HD and we were surprised by how much it has changed and even more surprised by how much it hasn't.