Access Ladder Racks 4000952 Strong enough to get the job done. Maximize transport potential with the model specific, easy to install ADARAC(TM) Aluminum Pro Series! The fully adjustable and removable vertical uprights are made from corrosion resistant, heavy duty aluminum with limited framework interference for hard tri-fold cover operation and increased cargo capacity. ADARAC(TM) Aluminum Pro Series is built for industrial versatility. ADARAC Aluminum Pro Series Truck Bed Rack System ADARAC Aluminum Pro Series Truck Bed Rack System. For Ford Super Duty F-250; F-350 6ft. 8in. Box. Access ADARAC Aluminum Pro Series 17-19 Ford Super Duty F-250/F-350 6ft 8in Truck Rack