Suspension, front end noise

Have a fine clunking noise under the front end (mostly on passenger side, haven't really noticed it at all on driver side) when driving and hitting small bumps. 30 MPH and a small bump like hitting a manhole cover or a seam between concrete slabs on the roadway (similar to the bumps you feel when going over a bridge) is all it takes for it to make a clunking/rattling noise.

Spent a couple hours under the van but nothing obvious appears to be wrong. I even tried to get things to "wiggle". Does not appear to be the exhaust system either as all the hangers are in tact and in good condition.