Double up the loading space on your Ford F250/F350 Super Duty (1999-Current) with this 6' 9'' (1999-Current) Slimline II Top-Mount Load Bed Rack Kit. The Slimline IIâ lightweight, modular construction allows you to customize your setup with over 55 accessories so you can haul all your outdoor gear and toys. This particular kit installs on top of the side channel of the load bed of your Super Duty.