mine just developed this weekend. and i have NO IDEA what it is. it sounds like it might be suspension related.. but i checked it and don't see anything loose. The rattle is pretty bad sounding on rough bumpy roads. It sounds like a big clunk when the suspension travels down, and then another big clunk when it travels up. but only on rough surfaces?

but the weird thing is.. i don't think i'ts the suspension at all. it could be something else vibrating? damnit.. can't figure it out. anyone have a similar problem?