weird rattle? PLEASE HELP

[JohnsD90]

OK, So since i have owned the 4runner the tailpipe has been competly disconected from the rest of the exhaust because its mount rusted out and is only held on under the bumper and i have not heard a rattle from it, Well yesterday morning it did some light wheeling before school in small mudpit, and no issues on the drive to or from school, when i go to get my haircut i start hearing this weird rattle like metal bouncing up and down when i would hit bumps in the road, idk what it is. now, i cant see how it could be anything other than the tailpipe, but it had never rattle in the past and it hasnt broken off any further, Any Ideas? i dont think its the rest the exhaust because when i checked it it seemed to be fine

 

[004Gunner]

Get a friend to smack the tires on the tread and sidewalls with a big rubber mallet while you are underneath the truck. You should be able to duplicate the rattle and find it this way.

 

[JohnsD90]

Get a friend to smack the tires on the tread and sidewalls with a big rubber mallet while you are underneath the truck. You should be able to duplicate the rattle and find it this way.

what a primitive method, sounds good