I figured the day would come when I would need one, the day is here I need a Load Panel for my Roof Rack!
You can see how in the picture below, there is no filler between the cross bars.
With a load panel similar to the images below, I will be able to not have things like the shower cord hit the roof and can be strapped down to something bolted to the load panel.
Look at the metal grate thats bolted between the cross bars that the traction boards and Rotopax are bolted to.
With the load panel I can attach hooks and other items to help with securly strapping items to my Roof Rack on a Toyota Prius