I'm in the market for a new truck but i'm still undecided. I like the GMC D/A but my buddy is trading his '04 because it has shut down 3 times on him while driving and the dealer can't find anything wrong... I like the looks of the Ford also but the 6.0 is scary!!!! The Dodge has a nice engine and a not so good tranny.. I'm hearing good things about the LBZ but i live at altitude in Colorado and i'm worried about the possible overheating of the Duramax.. Is this a concern? Need help!