I saw a clever aftermarket rear backup mirror on a minivan recently, and I'd like to buy one for my Suburban. It's about 9" in diameter, and attaches to the rear door of a minivan or SUV at the door seam along the side near the top. This makes it visible through the rear window, so you can see down to your trailer hitch. It would also be a great help when backing up in parking lots, to be sure I don't back up too far and ding a car parked behind me. Has anybody seen this item? I tried doing a Google Images search, but no luck so far. Very clever idea, and it didn't look too dorky on the back of the vehicle that I saw.