Auto body repair & detailing: Infiniti, bad wheel bearing, suspension component

Question
hi
I have Infiniti I30 everything is fine except some annoying things like the car is too hard mainspring and when you drive on highway you can feel all the bridge connecting gaps and it seems that you drive without tires.
And something wrong with mainspring of rear right side of the car, when I fall into gap I can hear the strange  sound of rubbing into something I'm not sure


Is there any way to make car softener and to fix this annoying sound when the car waving in the jam,'

Thank you very much

Answer
The tire pressure or type of tire can make all the difference in the ride quality.Try lowering the pressure a bit.If this does not help you just might need a different tire alltogether.As for the strange noise,it could possibly be a bad wheel bearing or another worn suspension component.