2005 Chevy 6500 a very good truck

Other than a few minor problems with brake warning lights coming on for no reason (sensors malfuntion) and a trans cooler line leak, It has been quite a good truck through the 1st 300,000 miles. It still drives like new although it probably could use some new shocks. Amazingly I still have a few months left on the engine warranty. I wonder how far this thing will go. Maybe GM could use a spokesman/posterchild for this truck and offer some free service?