I imagine the agri-jeeps with plow and disc implements would put quite a bit of stress on the hitch but were strong enough. My 3A obviously got well used in the past and it shows warpage in the hitch and the support bars that connect to the frame.
Normal towing shouldn't be a big deal,,,yanking stumps or jerking heavy loads certainly would.
I would be more worried about axle shaft breakage or shearing the splines when towing. This warrants questions about proper techniques,,,towing 2wd vs 4wd? Speeds? On what surfaces? I've got my owners manual somewhere around here, but I forgot what it says.