Daimler Truck North America is evaluating sites for a new assembly plant expected to open in 2029 while winding down operations at its longtime Portland manufacturing facility. Daimler Truck North America plans to build its largest U.S. truck assembly plant yet, a new manufacturing facility the company says will help it meet future demand while incorporating the latest production technologies. Daimler Truck North America says its planned new assembly plant will incorporate flexible manufacturing systems and modern production technologies. Great American Trucks: Freightliner Cabovers The announcement came just one week after DTNA notified Oregon officials that it will permanently close its Portland Truck Manufacturing plant at the end of October, eliminating nearly 400 jobs. Demand Rebounds After Slow Start The investment also marks a shift from the cautious tone Daimler Truck executives struck earlier this year.