Hey Poncho,
They are definitly heavy duty enough to handle about anything you put on them,the rearend is really stout.They are not as heavy built as the cub or john deere but really not to far off.They are more in line with the sears custom if you've ever seen one of those up close your talking pretty much like them.I'd say one would surprise you if you got a chance to test it out.They were your slightly lighter duty tractors back then but i'm telling you man i would bet money you could tie 3 new MTD's behind it and the motomower would pull all 3 in gear with them running lol KW