Access Ladder Racks 4000959 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 Full Size 2500; 3500 6ft. 6in. Box. Access ADARAC Aluminum Pro Series 15-19 Chevy/GMC 2500/3500 Full Size 6ft 6in Bed Truck Rack