Rattling noise

I have a 97 Thunderbird.92000 miles
When I am driving down the road and the road is a little bumpy it sounds like something is rattling on the driver side of the car. Not just one location but the whole side of the car underneath. Is that a noise like the strut would need replaced? A few weeks ago I had a front end alignment done and they said the struts look good. Last week I had new brakes put on and they didn't mention anything. He bounced on the front end and heard the noise.