Update!!! After all that remodeling of the front cap-still got this thumping/rattling sound. I put the pads on the antenna-very little help. I thought I located the noise in around the right front cabinet area. Tore that apart hoping to find some FOD in the area. Nothing but 1 little piece of wood they cut out for the electrical box. I will probably put insulation in the cavity that extends under the cabinet just because I can. Will take for a test drive again.
In my post on mounting the TV I show a few of the bolts that needed to be added:
https://forum.phoenixusarv.com/index.php?topic=3559.msg30570#msg30570In my 2006, and in Ron D's 2007 the roof of the cutout was not attached to the cabinetry well. Ron D does have a post addressing that.
On mine, you could see where the original 3/4" zip screws had gone through the Ford sheetmetal, but the threads never engaged into the PC cabinets. This made a spot on the passenger side vibrate and make noise sometimes.
I put (3) 1/4 bolts through each side, with washers on the bottom.
When I put the TV in, I also took out the partition that went across the front, making the 'forward' wall of the two side cabinets open to the backside of the front cap. Added some room, and made it easier to reach around back. When I did so, i found the 1x2 piece of wood was not fastened correctly: the staples used were two short, and the wood was vibrating up there. I put 2 bolts through that too... NO more rattles.
I thought I had some pics of this...

will look.
OK... found a short video i did showing the passenger side problems i found when I pulled the headliner -
https://www.dropbox.com/s/wimk4hnwvc51hh4/PC%20cab%20screws.MOV?dl=0 Now with carriage bolts holding things together, no more 'creaky ship' sounds when traversing rough terrain, and the highway rattles are gone.