As long as the chest is a few inches below the bed rails, the Roll n Lock cover will slide over it. My boss put a tool box (Weather Guard cross box) in front of his Roll n Lock. He had to cut the Roll n Lock's rails that clamp on to the bed rails but other than that, it's a pretty slick setup. He weatherstripped and siliconed the gap between his Weather Guard box and Roll n Lock in order to ensure it's rain tight/weatherproof.
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