RetraxPRO XR Rack Integrated Retractable Tonneau Cover - T-80371

tonneau cover with t slot   Dan tonneau covers with tslot tracks

I don't know much about this company other than I saw their website It might be an option for you com One negative I can see

cover operates independently of the tailgate, allowing operation with hitch-mounted bicycles in place There's a wide array of truck bed rail mounted T-slots My style mount for sure works with tonneau covers but I couldn't tell you for sure which one work slots, called and chatted Bakflip

3 slot linear diffuser EGR RollTrac electric Tonneau Cover for the Chevy and GMC 1500 incorporates patented features and technology you will not find anywhere else  I have used the Roll N Lock Tonneau Cover on my F150 for the past 2 years