It is known to attach rollers to the top of an automotive vehicle to aid in loading or unloading a boat or like object for transportation, e.g. U.S. Pat. No. 2,247,128 to Levey. It is also known to attach a luggage carrier to an automobile for swinging from a position above the rear thereof to a position well behind the vehicle, e.g. U.S. Pat. No. 2,800,264 to McFadyen. But it is not known to provide such a vehicle with a luggage carrier which is supported at its front end by wheels guided in parallel longitudinally disposed top-mounted tracks, and which carrier is movable rearwardly and downwardly to an upright vehicle-attached position for loading and unloading. It is the principal object of this invention to provide such a luggage carrier. Other objects and advantages will become apparent as the following detailed description proceeds.