Some perspective....
My dad bought an 03 model new when they first came out. Has roughly 180k miles on it now, but it is driven daily, and 90% of the time it has a trailer behind it. He isn't the biggest stickler for maintenance, so oil changes never got done on a routine basis. To this day he has changed his trans fluid twice (I kid you not), never changed his air filter, rear diff fluid, etc, fuel filters changed maybe at 30k intervals. Truck had the turbo replaced in 04, has had one oil cooler changed, and a bad ICP sensor. Other than routine stuff (tie rods, brakes, etc), those are the only issues he has ever had with it. Never tuned, stock exhaust. Granted, he has one injector that needs replacing now. that thing has been a workhorse it's entire life and the only time it's ever left him stranded was over a cracked radiator. If a stock truck can hold up to him, it can hold up to anyone!