Yep, I was the one that started that original thread.
What I ultimately ended up doing was hanging the tonneau cover from the wall of my garage using the cover's seat belt buckle straps. I purchased a standard bicycle storage hook & a pair of larger, padded 'L' hooks (used to store two bicycles in tandem). The bicycle hook is looped through the holes in the buckles & the 'L' hooks allow the cover to be supported on its rear edge so that all of it's weight isn't suspended directly from the buckle/hook connection. The cover is weighted in such a way that it pretty much lays flat against the wall, but I didn't want to take the chance of the buckle straps possibly failing by having all of the cover's weight being concentrated in one area.
If I knew how to post non-Internet photos on this forum I'd supply some pix of my arrangement.