Is there a bed cover that uses our factory rails???

Likea roll up cover...

 

Access Lightrider does. Comes with spacers and different bolts. take the rails off, install spacers under cover rails under bed rails and bolt back down.

Still lets you use the bed rail anchors- It's a bit harder to tighten them down...but it's doable. I haven't tried it with any other products like the cargo rails or dividers...

 

I found a Berlin rollup cover on ebay that uses the rails to mount the frame of the cover. Paid around $200 for it.

 

The Bakflip form Bak Industries - http://www.bakliner.com/
I have the F1 and love it, you just have to be williing to give up your rail tie downs. I'm working on an alteration to see if I can still make use of them.

 

Undercover SE uses the existing rails to mount the hardware. Installs in 30 minutes and is 100% water tight like a frogs ass. I love mine. The best thing is it comes off in 1 minute and only weighs 58 pounds. Its also very strong.