The top of the bed? As in the floor of the bed, or the top of the box rails?
I'd be more inclined to have the top rails and the interior of the box
sprayed with a tough liner material. My experience is that soft tonneau
covers flap and vibrate at highway speeds even when installed correctly, and
offer no security. Some I've seen actually rub and abrade the finish on the
top of the box rails due to this. Some have a plastic railing system going
around the top of the box and they attach to this.
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