We have a Rol Bak G2 hard locking bed cover. No drill install and pretty easily removable, but very heavy. Haven't had any problems yet but have been told on this forum when making sharp turns on uneven ground, the rails could be hit. We have an airhitch that sits just below the cover with a few inches to spare.
Our auxillary fuel tank fits below the canister of the bed cover. Also have a tool box between the aux tank and the hitch. Did a lot of research to find what will work for us full timing next year. Sorry, no help on the bedliner.
Safe travels
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