[overhanger]

Kevin,
An update: I'm going to have to find some adhesive-backed carpet squares to cover the plastic with. The first time the dogs jumped into the back of the truck, they slid on the lid and it scared them. When it came time to let them out of the truck, they simply did not want to cross the tailagate and they slid uncomfortably when they did. Both are Golden Retrievers, as you no doubt recall.
On a plus note, Christo really likes your idea and execution of the design. So do I!