After many months of thinking about it I finally bought a welder and tow bar from Harbor Freight and got to work. The finished product looks good and works well. Its just a hassle connecting the tow bar to the mower. Now that I have a welder I should be able to make something that would be considered a "quick connect".
Thanks to all for the help and suggestions.
This is my first attempt at attaching photos, hope they show up. The last one will show the supplied tow bar car connection welded to a piece of angle iron, all painted black to match. The angle iron has a hole drilled through it to accommodate a bolt on the mower "axle". There was no cutting or drilling on the mower itself, I just used the axle and bolt to hold the tow bar attachment in place.