Quote:
Originally Posted by 432bartman
Interesting video. 40,000 lb. rated steel hitch towing about half that weight, and it was a single weld that failed. Glad nobody got hurt and it was at slow speeds. Looked like a gorgeous trailer and truck.
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That doesn’t appear to be a weld that failed. Looks like the holes that would have a large pin thru them for side to side rocking pulled thru the bottom of the holes. The bottom of the holes is not where normal wear would occur. But there would likely be a force pulling upward on the pin (and bottom of the hole) on a stop.
It failed on a slow controlled stop.
Edit: googling found some interesting info. Apparently that is a known issue with those hitches. On starts and stops the pin “slaps” the top and bottom of the holes, eventually elongating them. And in this case pulled the bottom of the holes out!
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