T-slot rail on Tonneau cover?

tonneau covers with tslot tracks   Dan tonneau covers with tslot tracks

Get the toughest, most versatile truck bed rack on the market Specially designed for retractable covers with T-slots Reasonable priced Easy installation

They basically won't work with a bed cover, That's why some covers have the T slot tracks on them It's so you can run both a cover and a rack  It uses a T-slot track system that lets you fit crossbars across the Hard tonneau covers don't have this issue, but again, that

alice in the wild slot BAK Industries Revolver X4s Tonneau Cover with T-Slot Rails; No Drilling or Modification Required; Compatible with BAKBox2; Manufactured with Patented This versatile cover can be locked in any position and pairs with many T-slot rack accessories, so it's a versatile addition to your truck Most