Does anyone have any leads on a Solid cover to replace cardboard one that covers the spare and keeps the trunk floor level?
This. Instead of looking for an aftermarket one, create your own cover.IMO, the best cover to use is a piece of 1/4" plywood. Use the OEM cardboard as a template to mark the plywood, then use a gigsaw to cut out your new cover. If you don't have rug in there, easy enough to buy a cheap thin rug and cut it to match the new plywood cover.