I'm considering toolbox and bed divider options for my 6'4" bed. Who has the sliding toolbox 82211356 on the 82215286 cargo rails and/or the 82215481 sliding cargo divider? Wondering how that went together and worked out for you? Does the toolbox sit low enough to fit under my rollup tonneau cover? The pictures looked like it should, but doesn't hurt to ask before I drop cash on parts. Thanks!