We had two rattles in the back of our 4 door soft top in Moab. The door to the jack cover was flopping up and down, however, they said that production models will have velcro to hold that down. Additionally, there was a thin metal bar hanging from the very rear lower edge of the soft top, about a foot long. It was just to the left of the middle of that rear lower edge. Not sure what that was, but our driver stopped to stow it properly. After that it quieted down considerably as we hammered the vehicle through the desert. Other than that, I didn't hear anything abnormal to the punishment we were taking it through.
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4dr CG Bronco Badlands, 2.3/auto no-Squatch, Lux, MIC