What is the Thule Pro Bar for T Slot Tonneau Covers?

t slot truck bed rack   Dan tee slot cutter

Like the title suggests, looking for a bed rack andor crossbars that work with t-slots

rack offers endless possibilities for securing your gear The integrated T-slot channels make it easy to attach additional accessories Aerodynamic Design Adjustable Crossbar Truck Bed Rack Includes the lockings system to lock the truck rack to the truck bed The mount wide of the bed rack is adjustable,

riches666 pg slot It has the adjustable load bars to mount bicycles and other items but the tonnaue rolls up inside the bed and I hated that on my last truck  I am trying to figure out a rack and bed cover system that maximizes bed spacefunctionality with a good rack system For a rack, I would