2007 GMC Sierra SLE 2500 HD Duramax Diesel 4x4. Just under 200k miles. No DEF. Allison 6 Speed automatic transmission. I’ve had this truck since 2019, We used it mainly for road trips pulling a trailer or boat. I did not use it as a daily driver. It has a 46 GL auxiliary fuel tank plumbed into the main tank, controlled with a small valve. B&W turnover gooseneck ball. Suspension airbags. New tires put on at 188,520 miles. I have record of repairs and maintenance since I’ve owned it. I have the middle seat that can be swapped out for the center console in the front if you need seating for 6. Looking to upgrade to something a little newer. Thanks for looking.