I looked at Gen 3 5.9 CTDs for about 3 months until I got the 07 I now have about a month ago. One thing I noticed in my search, is a lot of dealers are getting their trucks from auctions in Canada since they are a lot cheaper. I drove 4 1/2 hours to Redding California to look at a sweet 06 QC short bed 4x4. When I got there, the first thing I spotted was rust bubbles in the bedside wheelwells that didn't show up in pics. Something you just don't see here on the western side of the states.

Of course in my email tag with the salesman, there was no mention of rust or that the truck came from Canada. When I got there, I asked for the Carfax, and sure enough, it spent it's entire life in Alberta. Needless to say, I turned around and drove home after a valuable lesson.