I agree, 300-350 static lbs hanging is really not an issue. The 3000-4000 lbs of static pin loads translate into a lot of dynamic load when you're humming down the road regardless of the hitch or pin box type one has. In addition, pin boxes and frames are designed with significant safety factors, my guess would be 2-3 to one at least.
I see no problem hanging the hitch from the pin box when you're standing still.
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