Not an engineer but I can see that there will be a LOT of stress on the metal in the the area where it failed. Throw in a drop hitch for increased leverage and maybe a weak or failed toad braking system and there will be a trementous amount of stress every time you stop or make sharp turns. Baring a recall or specific instructions from Thor - perodic visual inspection is mandatory. For the first time I am questioning the use of NSA braking systems especially with heavier toads. I would look for Morride to add two more holes and hitch mfg. adding a piece of angle for a cheap fix in future builds.
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