My boss has an 03' Duramax. We traveled all throughout Ohio, Michigan, Kentucky, Illinois, and Indiana working tractor pulls. We towed a 45' 16,000lb goose neck trailer. About 80% of the miles on the truck are from towing the trailer, think it hit 115k at the end of the season. It's still rollin coal like a fucking champ. Never struck with the fuel injector issue though.
You guys might get a kick outta this. My first time towing. This was a dsm my buddy bought. This is my boss's truck though.
http://i51.tinypic.com/219wac0.jpg