Various vehicle systems are proposed for accessing and utilizing vehicle cargo spaces on vehicles equipped with a tailgate assembly. The vehicle systems may include deployable and/or rotatable stairgate systems, deployable step systems, etc. designed for the accessing the vehicle cargo spaces. The proposed systems may include various deployment mechanisms that enable the stairgate/step systems to slide, pivot, rotate, swing, and/or otherwise adjust for providing ease of access and increased flexibility when stepping up to access the vehicle cargo space.