Burl, don't fret. I am a wannabe engineer, and wish I had all of your knowledge to look back on.
What kind of hubcaps/wheels do you have? I have stainless liners, and my center cap is not as snug as it should be, and makes that clicking noise. I just have to make an adjustment or inject some old reliable, silicone sealer!
As for the tv overhead, I had some of those problems too. First, take it out and make sure you don't have about 2 miles of romex and cable laying on the roof of the cab. I secured all of mine with zip ties and screwed in cable clamps. My dealer shimmed the tv against the frame. It helps, but I do question the wisdom of putting pressure on a plastic tv box. I added a rubber weatherstrip to the rear of the tv retention frame. its that hollow tube style. It all helped quite a bit, but my solution, in hindsight would be to let T/L keep their tv, and get a smaller LCD flatscreen, mount it to a sturdy door, and have more cabinet space behind it. Oh well...