A stair system that is associated with a cargo platform of a commercial vehicle for transporting goods is disclosed. The stair system is integral with the vehicle and/or the cargo platform and provides a user/operator with easy and safe access to the cargo platform without occupying the storage space provided by the cargo platform. The stair system can be arranged in a deployed configuration when in use and in a stowed configuration that is road-ready and does not prevent the vehicle from being operated on paved roads.