I recently returned home from a 600 mile trip, and while on the highway, there was a consistent squeak/rattle from the passenger side. It was extremely annoying to say the least. My other 2 passengers heard it, and we couldnt find anything to stop it. Has anyone else experienced this noise?? The thing i couldnt understand about it was it was happening on the interstate, the road was smooth.. i just dont know what it could be.