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To [USER=519]@Ron[/USER] point, could it be air/ aerodynamic forces? Or if it's her bike hauler, could it be harmonics/ pulses from wind going over bike mounts? (Assuming it's a roof mounted rack) just asking cause had a guy I worked with that installed aftermarket roof rack bars that just clamped into the door sill above the doors and he would get a similar issue. He never put the two together since it had been on there awhile before he ever hit the speed that would cause it and had me drive it and that's what I found out it was.