Noise at the Rear on Bumpy Roads

I hear some vibrations and noise at the rear left side, sometimes both sides when I enter Bumpy Roads. I feel it is the shocks, but someone said it is the linkage and bushing, I have not had it checked though, but I want to know if I should be really concerned?

I just got the car as the second owner, it was used in Chicago and was exported to Nigeria.

Please help. Thank you