A sliding door module structure for a vehicle may include a module bracket on which a door associated component is mounted, and a door rail formed integrally with the module bracket and coupled with a slider configured to be connected to a vehicle body to be movable.

A sliding door system includes a support guidance for suspending a door leaf with respect to a framework. A steering track is fixed to the framework and an engaging front lever is mounted at a front edge of the door leaf. The support guidance is arranged independent from a steer guidance which provides a design freedom in which a rigidity of the support guidance can be increased independent from the steer guidance. The steer guidance can be designed with a compact configuration. A mechanical chain of connections of the door leaf to the swing shaft can be made more robust by adapting at least one of a slide bar, a sliding carriage and a swing arm, such that a substantial support of the door leaf is provided by this mechanical chain of connections.