This vehicle is a the worst reliable truck I ever owned. It has been in the repair shop 8 Times with emissions problems, 1-rear end, and 1 front wheel hub. It appears these diesels made after Jan 2007 are a enviromental emissions nightmare and have to be serviced every 1,000 miles or they plug up the converter, egr valve, and egr cooler. They charge from $350-$1000 each time, I understand the 2008's have the same problem.
They might test these new emissions systems before the sell them to people.