2021 Kenworth T680 – Double Bunk, Diamond Interior, Cummins X-15, Automatic This 2021 Kenworth T680 is built for both comfort and performance. Powered by the reliable Cummins X-15 engine and paired with an automatic transmission, this truck delivers strength, efficiency, and smooth handling on the road. Inside, the Diamond Interior offers a premium driving experience, featuring a spacious double bunk sleeper designed for maximum comfort during long hauls. With only 519,575 miles, this unit has plenty of life left and is ready to work for you. Whether you’re expanding your fleet or upgrading your ride, this Kenworth T680 is a dependable choice that combines durability with driver-focused comfort.