Rambox Cargo Rails Top Slot

[ShadowDragon]

For the Rambox with the silver cargo rails, what is the slot on top of the rails for?
The cleats are pretty self explanatory, but I have not found any information on any kind of accessory to fit the top slot.
It looks like it could take T-nuts, but all the covers I've found both into the cleat slot or clamp to the entire rail....

 

[mikeru82]

A pic would be helpful here.

 

[ShadowDragon]

A pic would be helpful here.

The side of the rail is for the cleats, the top is a t-slot.
It looks like you should be able to use it to mount something, but all the tonneau covers use clamps or bolt into the slots used for cleats.
I seriously have not seen anything that actually uses the t-slots....

 

[disarm]

My BakFlip MX4 used rails that slide into that channel. That's why I had to switch my bed rails to the silver ones as opposed to the black ones that came with the factory tonneau/Rambox combo.