I have the exact same issue. I thought something had broken loose between the quarter panel and interior panel. It ONLY does it when hitting an entrance (driveway, parking lot, etc) that's a different level and only when I hit it at an angle to soften the spine compressing jolt. That slight amount of body flex seems to cause it to happen. It sounds as if it's coming from just behind the seat under the front edge of the fixed window.
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