I don't have a picture but I made a 3pt tree grubber to remove Eastern Red Cedar trees in my timber. While I was at it I put a 2" receiver tube in the middle of it. When it's not doing grubber duty I pin in a receiver with a 2" ball. Works awesome to move trailers around.
You can also buy a drawbar for your 3pt and a pair of drawbar brackets to keep it from rolling and put a ball in it.
Cheapest way to do it is to get the short (20') cat 1 bar as in Radioman's picture and bolt on a reciever made for a truck bumper ($40 or less).
Buy the little device that keeps the bar from rotating and you are done.
Other wise do what Radioman did or have someone make on like it for you.
The "factory made" version will cost you a couple hundred bucks.