Not to mention if the receiver separates from tow vehicle, you probably have worse things to worry about at that point in time...
I've only heard of it twice, once was a uhaul-installed hitch with brass bolts (to prevent corrosion of course), and the other was a 2nd gen Dodge that had a metal fatigue failure from being overloaded all its life (rip parts of the frame off too). In all my years following the diesel forums, those are the only two hitch-related failures I can remember.
I worry more about someone tampering with my setup...stopped at a rest area, some teenage kids were hanging behind a SUV when I pulled in. I ALWAYS do a walk around before I start back down the road...the jerks had pulled the spring clip from the hitch pin so that it would fall out later down the road.
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