We have three 2500 6.0l trucks at work, two are 2002 and the third is an 05. These trucks pull trailers that weigh around 6000 lbs every day locally and have been rode hard and put up wet. One of the 02's has around 140k the other 130k, the 05 has 95k. Both of the 02's have been problem free except for a bad trailer hitch on one. The 05s drivetrain has been solid but little things have been giving us issues, the blower motor for example. The 05 is usually down a quart by the time it is due for an oil change, the 02s not so much.