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Kenworth introduced the C580 heavy-haul truck to replace the C500, pairing a proven severe-duty chassis with a new cab. The Paccar unit has set production to begin in January 2027.

The typical year‑end push inflates December totals, making a sharp January drop unsurprising, though ACT Research noted this year’s decline was larger than seasonal norms.

U.S. Class 8 retail truck sales capped off what has been a generally down year with a sequential boost in December, according to data from Omdia Automotive.

Classes 4-7 retail truck sales for the month decreased 15.5% to 19,082 units from 22,586 a year earlier. Medium-duty sales haven’t trended ahead of the prior year since January 2025.

U.S. medium-duty truck sales are on track to end 2025 with only one year-over-year increase, that coming in January, according to data from Omdia Automotive.