Look in a Northern Tool catalog and you will get some readily adaptable ideas that should not be too expensive to implement. I.E., using a bolt on bumper hitch receiver fastened to the draw bar and a piece of heavy angle iron to run from the top of the three point to stabilize the draw bar.
If you can expand this picture, you can see what I had made up for mine. Instead of the two metal bars running to the outside of the draw bar, a piece of angle iron straight down the middle would accomplish the same purpose.