Freightliner Cascadia 2025 Bed Size Chart. In terms of standard semi truck mattress sizes, the closest that will fit in the back of one of these rigs is a twin or queen. A freightliner cascadia can fit a 36″ x 80″ mattress.
The size a sleepdog® or bigdawg™ mattress measures 36 inches by 80 inches while the size b measures 39 inches by 89 inches, either of which should fit perfectly in a freightliner truck. What size mattress is in a peterbilt sleeper?