That is a North Face ground cloth, which model Tent I can't remember off hand. The ground cloth has turned out to be a perfect choice, the rubber side grips the Jeep, is quiet and packs up smaller than a tarp. I sized it so I can use it to cover the Jeep when parked Topless if needed..
I have an upper rear cross tube on my cage similar to a RockHard bolt on. I welded two 1 1/4" dia. x 3" long tubing spuds to the same clamps Rockhard uses, then mounted them pointing backward. I have two 4' lengths of 1" dia aluminum tubing that just push in to the spuds, quick and easy even with one hand. I keep the tubes real handy and with the rubber feet they hold the fabric gently, I also can lay the soft top window across the tubes for quick shelter without the rainfly, just like the hard top.
This pic is in a steady high wind, usually only one 1" nylon strap is used in the middle of the Jeep.