I dont know how it all went down for this guy but I do know that I weld the nut onto the bottom of all of my personal trailer hitches.
About 15 years ago I was driving down the road with a buddy who was pulling a stump-grinder behind his truck and the nut came off the ball while we were turning left and the stump grinder went right and flipped 10 times out through a field.
I remember mentioning the lack of safety chains when he was hooking it up. "Ya, its all good as long as you got lights"
Honestly, I am glad there were no safety chains because the truck was under-powered for the task at hand...no telling whta would have happened if we had been hooked to the thing lol
Good times.