everytime i go over a bump/pothole/little mess ups in the road my truck rattles really bad. its getting on my nerves. it sounds like the doors arent shut but they are. they dont seem loose, neither does anything else. is it just cuz its old? i was thinkin about worn struts or somethign but it doesnt bounce up and down alot after bouncing the front end which is an indicator of worn struts. its a 1991 4 door v6 4.0L. any suggestions would be appreciated.