Just seeking opinions on a used Duramax

phone man wrote:
http://www.coverthutto.com/Used-2005-Chevrolet-Silverado-2500HD-LT-4X4-CRW----Round-Rock-TX/vd/27421052

I just bought my wife a new car two weeks ago and saw this truck on the used car lot. For some reason I keep thinking about it. I currently tow a 8K travel trailer with a 2000 Ford Excursion V10, but have always wanted a true truck for multiple reasons. I have never owned a diesel, but I do know that some Duramax motors are more desirable than others. Anyone have an opinion or random thoughts about this year and model? Thanks for any response and I apologize if I am beating a dead horse in regards to the topic.