Freightliner Cascadia Frame Crossmembers: Strong and Reliable Keep your Cascadia strong and stable with durable frame crossmembers. From walking beams to rear-closing crossmembers and fiberglass frame covers, these parts are built to replace worn or damaged components with ease. With options for different weight capacities and mounting styles, you'll find the right fit for your truck. Perfect for maintenance or repairs, these crossmembers ensure your Cascadia stays road-ready and reliable.