2021 Kenworth T680

Duty cycle shows up in the odometer, 438,750 miles points to steady highway service and a truck that has lived in the seat. Conventional sleeper layout fits long runs, slip-seat teams, or regional work where a bunk matters, and the mileage suggests a buyer should plan on verifying maintenance history and recent wear-item replacements rather than treating it like a low-mile trade. Powertrain details are not provided, so the evaluation needs to be inspection-driven, ECM hours, idle percentage, and any active or inactive fault history are the first checkpoints. ECM printout, aftertreatment health data, and a road test under load will tell the real story on turbo response, regen frequency, and shift quality, and they matter more at this mileage than cosmetic condition. Frame rails and crossmembers should be checked for straightness, corrosion at fastener points, and any evidence of prior repairs around suspension hangers and fifth wheel mounts. Fifth wheel jaws, slide rails, and air lines are common wear areas at this age and mileage, and they should be inspected for slop, cracked welds, and air leaks. Cab upholstery, sleeper seals, and dash switches give quick clues about how hard the truck was worked, and they are easy to verify during a walkaround. Tires, brakes, and steer axle components should be measured and documented, tread depth, rotor or drum condition, slack adjuster travel, kingpins, and steer tire wear patterns can flag alignment or suspension issues before they become a shop bill.