2021 Peterbilt 567 Quad Axle – Work-Ready & Built to Haul This 2021 Peterbilt 567 is a serious heavy-haul machine powered by a Cummins X15 paired with an 18-speed Eaton-Fuller transmission. Quad-axle setup, and a 44” flat-top sleeper make it ideal for demanding jobs and long days on the road. Major plus: the engine was replaced with a brand-new unit just 40,000 miles ago, giving you reliability and peace of mind without the new-truck price. Clean, well-equipped, and ready to earn from day one.