Check for a cracked engine mount. I had to replace mine about six weeks ago.

You could have bad mounting bushings for the struts or it could be other bushings in the rear axle tracking arms. in order to find out you have to jack the vehicle up.(use jack stands to support the vehicle for safety) check all the struts and shocks and any componant that has to do with keeping the wheels on the ground . that is what the strut/shock is for. check the coils spring to make sure they are not loose. the coils spring keeps the body from bottomning out... hope this helps..........please rate.