burlmart -- my overcab compartment with three cubbies moves only with the cab itself. It does not vibrate and move independently of the cab. We carried a TV up there for a while, but with the rough roads we frequent the TV was moving and bouncing around too much. Plus we really never chose to watch it. I got a gizmo that allows us to watch TV over my notebook computer that is a bit cumbersome but adequate for those rare times.
this particular "thread" is VERY broadbased as far as topics, and is more a group of layed back friends who exchange ideas and comments. if you really want a timely answer to a focused question or topic, consider posting same as a new topic.