But nobody I know considers an F150 to be big. Those are commuter trucks, it’s the Ford maverick around these parts. The maverick is a very efficient car with a bed.
Big trucks start at 3/4 ton and technically even the Big 3 consider a dually 1-ton with 8’ bed to be “light duty” in every spec except marketing because “HD” sells.
Medium duty starts at F450 and higher and they don’t come in any trim but 8’ bed.