I think that the "bending force" / i.e. load on this specific area which causes this kind of crack / metal fatigue mainly occurs during the closing process of the door. When the door is closed there should be very little force on this areas as everything is locked and held in place.
This bending force during the closing process will be even bigger if the door is sagging / not properly aligned.
If the door is misaligned you have virtually a double impact.
The more you open and close the right hand side the more wear on the hinges.
You could also say that the increased weight of a bigger tyre will have an effect on the wear of the hinges.
So.. I think it is important that the alignment of all components of the barn-door assembly is as good as possible in the first place to avoid premature fatigue failure.
At the bottom of your RH barn-door you have a horizontal striker (round bolt) .
This striker slips into a tapered guide mounted on the vehicle side.
Make sure that both components are aligned perfectly.
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