[RodKnock]

Now after driving almost 500 miles on my car, I've noticed that the panel behind the seats in my Kirkham vibrates, but only at idle, since I assume that's when the car shakes the most. Have others experienced the same problem and, if so, how have they fixed it? Silicone sealer? Carpet? More rivets? There are plenty of rivets and they all seem to be tight.

When pressed upon by hand, at idle, the vibration disappears. Thank you in advance for any suggestions.