Recently my srt has started to handle very weirdly. I notice it on freeways the most, though it happens on streets too. If the road gets bumpy my whole car starts vibrating very hard, and i am getting a lot of side-to-side movement. it feels like its trying to fishtail but with all 4 tires.

Its getting to the point where its almost scary to drive on the freeway because its hard to stay in my own lane.

Any ideas? Thanks!