I am experiencing the exact problem as you used to, front clunks only on bumpy road, and rear groans when both wheels going over bump.
I will have sway bar bushings checked.
99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.