Rattles caused by Excessive Body Flex/ poor torsional rigidity

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HI,

I have read a lot of threads relating to rattles and squeaks but havent come across any that mentions that it could have been due to some abnormal body flexing of the E70.
The BMW E70 is supposed to have a very rigid body structure (torsional body stiffness) compared to a lot of other vehicles.
only after 4 months of purchase, my A-pillar trims, B-pillar trims, tailgate they all make a very unconfortable noise every time i drive over uneven ramps at shopping malls, etc.

I tested it by putting a wedge on the front right side wheel another on the rear-left side wheel and drive over it to simulate a body-flex and the above mentioned pillars all makes this unconfortable noise. while the car is on the wedge, slightly opened the front door and tested close it softly, and it would close softly.

is anyone else experiencing noises coming due the flexing of the body? or is it just mine?

the E70 is supposed to have extremely good torsional rigidity

YouTube - BMW E70 X5 Technical Demo


check for "rigid":
3.0si and 3.0si Executive Models Flesh Out BMW X5 Range - AutoWeb News
BMW X5 5-dr wagon range - First drive: BMW's new X5 raises the bar - again - New Models
BimmerFile Archive 10 Years of the BMW X5
2008 BMW X5 Pricing and Information | Conceptcarz.com (15% increase in torsional rigidity)