Spare Tire Mount..Rear Bumper Best Location?

I wouldn't mount one on the rear bumper with a typical mount but if you wanted to make one I would think if you made the bracket that held the tire come up in the front part of the bumper and make it tall enough that your tire would rest on the top of the bumper. This would take away from the leverage force that works on the type that hangs off the back of the bumper. I would also mount it as close as possible to the frame extension where the bumper is attached.

I had a spare tire mount on one of my small aluminum trailer on the side. The told me if they didn't support the underside of the trailer that it would ripe the mount right off the trailer because of the leverage. They mounted a small rounded piece of aluminum under the tire to support it and it worked great.