Access Ladder Racks 4001227 Rugged, strong and built to perform, the ADARAC(TM) Aluminum Series is constructed from heavy duty corrosion resistant aluminum to safely haul a hefty load. For a sleek aerodynamic design, the completely adjustable and removable uprights contour to the cab. Simple to install and ready for anything, the ADARAC(TM) Aluminum Series will easily carry your next adventure. ADARAC Aluminum Truck Bed Rack System ADARAC Aluminum Truck Bed Rack System. For Ford Super Duty F-250; F-350 6ft. 8in. Box. Access ADARAC Aluminum Series 17-19 Ford Super Duty F-250/F-350 6ft 8in Truck Rack