Tail gate splitting
Absent any damage you may have inflicted on the tailgate somehow, I'd lean towards a material defect in the aluminum during manufacturing. That's a very tight bend radius and a very high stress area when the panel is being formed.
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Do you have the tailgate step? Just trying to think through how this could happen. Maybe a few spotwelds were missed and the stress of the step being used created a crack and then with how thin the aluminum is it spread.








