We tow with a 2006 2500HD LBZ and love it. When we bought it from a private owner we were told, not by her, that it was the best they ever made. We bought it 3 years ago with 32K on it and it is now almost to 90K, most of it towing our Keystone Everest back and forth across the country, up and down both coasts and into the Canadian Maritimes. We've only had one annoyance, the turbo crossover pipe came apart several times and it has now been fixed thanks to a TSB from GM. We run Michelin LTX MS2 tires and are on our second set. Did I say we love it?
Good luck! Bob
2007 Keystone Everest 293P, 32'
2006 Silvarado 2500HD Duramax, SRW, CC, Short Bed, 4x4
Sidewinder,16K Draw-Tite Slider
Chloe, Standard Poodle
Charlie, Tibetan Terrier