Mighty Max Rear bumper / Trailer hitch solution

Towed a Porsche 944 with a tow dolly three years ago..... The rear bumper was bent...Still usable but it's bent and i am questioning its reliability as i am planing to use my mighty max to tow my motorcycles......

Any cheap solutions? Ideas? Part source is strongly appreciated....

Or maybe get some square steel tubing and weld something up? I don't care about appearance....I need reliability and dependability........And it may be a good chance to learn about welding...I had a small harbor freight flux welder...but it looks like i can't do clean and decent job with it. I am thinking of getting a stick welder or MIG welder...howe ver MIG requires gas which cause trouble for DIYers like me....any ideas?

Cheers

http://www.mightyram50.net/vbulletin...railer-Hitches