Our 98 ML320 has had a rough ride for some time now. At 92K miles, I had just settled in my mind it was due to wear in the suspension system. Our roads around the Memphis, TN area are extremely rough with an estimated 7,000 semi trucks passing near my house per HOUR. It started back in the winter, with a clunk in the front end. I replaced the sway bar supports (the old ones with a solid bushing that are notorious about clunking). The clunking went away for the most part (still there some on really rough roads), but ride still wasn't the best. I put Monroe Reflex shocks on, and it improved the front greatly (even boosting ride height a little in the front). Ride still not what it once was, though. I replaced the worn Dunlop tires with Bridgestone Duellers in August - road noise went away but ride was still the same. I have suffered with this since, thinking the rear struts were in need of replacement, and maybe some bushings. My wife took it to our local German indie (really a German - his name is Deitmar), and he asked if we had checked tire pressure lately. We hadn't, as the tires are new and haven't leaked down a bit since August. He deflated the tires from 32psi to 28psi - WOW what a difference. Obviously the tire installer inflated to the standard 32psi we all grew up with, and it WILL make the ride extremely stiff. Lesson learned for FREE, I was about to shell out MB big bucks for rear struts/springs. The only noise I have left in the suspension is from the inability to change the sway bar end bushings due to seized bolts on the end clamps. I've got to tackle that one soon. I am going to buy the bolts from MB, and drill out the old bolts to remove the clamps. At least that's the plan, may just end up buying clamps and bolts and taking the Sawzall to the old clamps for simplicity's sake.