Well, if you did everything, you would not have a vibration. My 2005 Mercedes is 20 years old and as smooth as glass. It has 136,000 miles on it, just over 200,000 Km.The first car had a vibration coming from underneath the car or rear, everything was replaced including motor mounts, i even replaced them two times. The new to me car has a vibration the steering wheel. The whole front end is new. At this point i am not looking for answers and ideas, everything possible was done. Only the bearings are original.
It is not age, or miles, that cause the problem, necessarily, it is the failure or damage of a component, be it bushing, tire, wheel, etc.
Why start a thread with a question, and then say you don’t want answers?