I have the Hi Rise Crossbars. I like that they can mount over a tonneau cover, specifically a DiamondBack cover which I have. Here’s pictures of the hardware and cross bars after I opened them, they arrived quick.
Here’s how they look installed. I originally put one cross bar over the front panel and one over the back panel of my cover. However this blocks the panels from being able to fully open, so I moved them to both go over just the front panel leaving the back panel able to operate as intended.
My plan is to use them for now to mount my Maxrax and maybe a shovel or something and eventually possibly a RTT