Just one theory that it might not be the suspension? I notice a loud thump going over speed bumps but I didn't recall noticing it the time I had a big bag of cat food in my trunk. I thought it was the trunk liner flap flopping up and down so I just normally shrug it off. My F30 made the same noise.
I'll try and throw something big and heavy in my trunk next time I go to work and see if it reacts the same way.
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