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at first i was gonna suggest you check your driveshaft for excess play, but on second thought you might be experiencing some wind deflection problems caused by the camper. i had a truck once with racks that went over the cab. at speed the wind coming off the windshield caused the front most bar on the rack to oscillate. a bug shield/hood mounted wind deflector might solve your prob.

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Q: Have a 03 2500hd ext cab with 10ft cab over slide in camper at 55to65 the truck roof vibrates severly sounds like thunder anyone else have or had this problem?
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