Abstract: A cargo support frame structure for vehicles is disclosed as including a replacement rear supporting bumper having two upright members attached thereto and extending above the bumper to a predetermined height that is, for most types of vehicles, in excess of the roof height of the vehicle. A connecting member is disposed between one end of each of the upright members opposite to where each upright member is attached to the supporting bumper and is attached thereto. A longitudinal member is perpendicularly attached near to the center of the connecting member and extends longitudinally generally parallel with the center-line of the vehicle. A front cross member having two ends is attached to the end of the longitudinal member that is opposite to the end where the longitudinal member is attached to the connecting member and extends perpendicular with respect to the longitudinal member. The two ends of the front cross member are each attached to a front upright member at a first end of each front upright member.