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I've always wondered that. Nothing underneath it. I was even going to cut my aftermarket carpet to have that since it's stock. I imagine it was to help draw out moisture.
To secure your full size wheel/tire when your space saver spare was in use. There is a steel loop built into the bed of the car that your stock spare hook will secure into. You can see the loop in this picture.
To secure your full size wheel/tire when your space saver spare was in use. There is a steel loop built into the bed of the car that your stock spare hook will secure into. You can see the loop in this picture.