Hey Guys I bought my truck used last summer from a dealership and it already had 180,000 miles, B&W Turnover Hitch, 315/70R-17 tires and a Banks Six Gun Diesel Tuner (that wasn't hooked up correctly). I'm pretty sure it was a work truck for someone because there are couple of small antennas on the top of the cab with coax cables coming into the cab and a small radio mount on the passenger side (not CB antennas) plus the hitch and high mileage. I have no clue how it was maintained or anything about it. It seems to run great and no major issues right now other than worn idler and pitman arms which I'm replacing today. I'm trying to get an idea of the life expectancy for this truck and Duramax Diesels in general. I Love my truck and don't want to replace it anytime soon.