I'm not at home at the moment so I can't look, but are the two rear bolts rubber mounted? I can't remember. I wonder if this could be a ground/electrolysis type of problem and it's taking it out on the front mount welds?
Just a thought. It's either that or just vibration from the high rpms of a thumper buzzing cracks in the mount, then water collects and it rusts.
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