A mobile roof loading system is provided for operatively attaching to a roof of a vehicle such as a trailer, to provide access to the roof, and hands-free access to the roof in some embodiments. The system may for instance include a stairway body configured for pivotal attachment to a vehicle, the stairway body including a plurality of steps and a step support, the stairway body further having a contracted configuration and an expanded configuration, such that in the contracted configuration the stairway body is retained adjacent the vehicle generally between the roof of the vehicle and a bottom side of the vehicle; and in the expanded configuration the stairway body forms a stairway path from the roof to nearby ground at a stairway angle such as to provide a desired stairway path.