I can't follow all of the technical aspects of this, but is it something that 3.7 owners should be concerned about given the additional torque of the engine on, I assume, very similar parts?
There's no point in worrying about it as it may never happen. If it does it's no big deal. I was in Sweden when the mount broke so I tied the shocker back to stop it flopping about, drove on and barely noticed its absence.
The original ones lasted for about 60000 miles so I suspect the heavy duty replacement must have been suspect as it failed after 5000 miles.
If it happens again I'll start a new thread posting an open letter to the parts department and await the seemingly inevitable vituperative response from Boshly.