Solid (rolltop or folding sections) bed cover + cargo racks?

TrackRax has a bed cover option, but it's soft.
Pace-Edwards has something with a slot in it, and they offer Yakima "Control Tower" mounts - but they're only a few inches
Does anybody know of a solid bed cover that can be used with cargo racks?
The cargo racks need tb high enough so that if something on them protrudes forward, it will clear the top of the cab.
Yakima accessory-compatible preferred..

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