Did you notice any difference in the quietness of the ride after switching to ridge grapplers? I have them on my truck and they made the ride not so Denali like.
I had the dealer add the Webasto sunroof when I bought my truck. No problems, and looks factory. I was very nervous as I had heard horror stories as well, but I'm glad I did it and would do it again.
I had a squeaking coming from my rear seat and it turned out that the dealer didn't tighten the bolts down all the way that hold the rear seat to the floor.