What product or method have you used? I want to attach to the rear of my 2005 Sportsman 500 to protect my treestand carrier. I can't seem to find a single piece rubber mat dedicated for this purpose. Two piece options are out there, but I prefer a single.

 

Just a thought but you might try a snowmobile rear flap. You did not indicate the size you were looking for but those come in a few different sizes.

 

Buy the cheapest rubber pickup truck bed mat you can get and cut it to size. Attach with large fender washers so it doesn't pull through.