I tried to order one from kia.parts. It was supposed to be in stock, but over a week later they still hadn't shipped it. They cancelled my order and gave me a refund, no idea why they never shipped it.
It basically looks like an IKEA topper, but instead of being Swedish plywood, it's crappy Chinese "steel". Looks like over 50 cheap nuts/bolts that will come loose every few thousand miles. I would defiantly find someone to weld it together instead of trusting those bolts.
Living and working in metro Detroit I see them all the time. There seems to be a lot more Mavericks in general around here than most places. When I travel outside of the city I rarely see any Mavericks at all.
I had one with my first mav that had the factory hard trifold and with my new mav and my diamondback HD. Works with both, should work with every tonneau out there.