Kevin, the sounds you hear while driving are usually very misleading with regard to their location, and "usually" a thunk sound over bumps is something to do with the rear anti-roll bar - maybe one of the bolts from a drop link is missing and allowing the bar to hit the underside of the tub when it moves, or possibly one of the bar mounts has pulled away (broken off) from the underside of the tub (both are common problems) - check that out first.
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