What is wrong with this darn car?

90 Lumina 3.1. I have had 3 mechanics look at this car, I have looked at this car and my husband has as well. No one can find anything wrong. Symptoms: car rumbles on RF intermittently, especially in snow. If the RF hits a bump, i.e speed pump or gas caps at gas stations it moves my steering wheel. I have a clunk that is felt on stopping and accelerating. I can coast to a stop sign and it doesn't do it. Depending on what kind of bump I hit I get a sound under the RF. Steering wheel feels heavy at times. Car makes slight clunk that is felt going into drive intermittenly and has always had a clunk going in reverse. When making a sharp turn left it feels as if the tire is going to fold under the car as if too much weight or whatever is present. I suspected suspension related but watched 2 mechanics take apart my struts and they are fine. All balljoints and tire rod ends are new as well as sway bar bushings. Control arms look fine and struts and mounts are a year old. Engine mounts and dogbones are new. Tires are new. I get great gas mileage. I can pull and yank at the tires and they dont budge. The whole rear suspension is new. I suspect I have a broken tranny mount but when checked the new engine mount moves more than the tranny mount and it isnt much.Ideas before I start shelling out alot of money replacing stuff I really don't need?