I wouldn't think it's a body bolt. Then again, I didn't see how badly you bottomed out. Doubt it, anyway.
Check your sway bar bolts. My driver's side bolt was loose and made a clunking type sound on bumps.
Do you just hear the clunking on bumps or driving in general? If it's driving in general, I'd take a look at your driver's side hub.
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-Eric
2000 Excursion Limited, PSD, black, fully loaded, Western Diesel chip, Viper 550 alarm w/ remote start, Alpine CVA-1005 6.5" head unit, Alpine DVA-5200 DVD player, Alpine CHA-1214 12-disc CD changer, 21% tint all around