Not yet. Based on others' inputs, I gave up on contacting the dealer.
I am thinking about trying to make a platform using those stiff, lightweight, rigid, foam insulation boards one can buy at a home store. I believe the 2" thick board may be just enough. If not, I'll glue another one on top; another 1 or 2 inches thick, depending... I figure I can cut out custom shapes for each of the left and right sides, glue some fabric onto them, and install them when needed. The only problem will be storing them in my crowded garage.
The old foldout floor would be way better!