I have an 08 Duramax that I bought new. Generally speaking, it never let me down, although I have never worked it. Just some of the gimmicks that quit. There is a few thousand dollars of equipment in that thing that makes up the integrated trailer brake system. In my mind, this does nothing more than an On-Sale $49.00 aftermarket controller but costs you plenty if it fails, and you can't even put the tranny in trailer towing mode! This type of BS, drives me crazy about my GMC. Reminds me of JD! Too much high tech BS just for the sake of it!
The Japs have more of my respect in that respect!
I would look at the Dodge 1/2 ton Diesel if I were looking to buy!