An apparatus for automatically coupling a tool to a manipulator having a spindle. The tailgate assembly further includes at least one stiffening member which is selectively and operatively contained between the panels and which increases the strength and durability of the tailgate assembly. A lighting element includes a light source with related integrated optics. A knuckle fitting is received within the bore and is engageable with the retaining region. Moreover, the compression storage bag has an outlet, which makes it possible for the air inside the storage bag main body to flow out through the first non-return valve and the path. The body includes a hull, an open cockpit, a ramp that is located aft of the open cockpit and slopes downwardly toward the stern, where a lower end of the ramp is located near the stern, and a transom, where the lower end of the ramp extends through the transom.