I have a mysterious rattle under the back of my truck when Im on bumpy/washboard roads. I checked the spare tire thinking that might be it but no luck. Best I can tell is that the overload spring is hitting against the rest of the leaves on bumps. Anyone have any ideas? When I get into really bad roads its like a machine gun under there and even if I slow right down it still does it just alot slower. Should I try clamping the overload tight to the rest of the leaves?