Thanks for the input. I went to look at this Bigfoot expecting a rubber roof and was surprised to find the fiberglass. From talking to the original owner, the fiberglass roof was an upgrade from the factory. After curing, the Hengs that I added appears to be the same as what was up there previously and has bonded well to the original sealant. I will keep an eye on it to identify any separation that may occur.
Beagle was correct in that after doing some prodding, I believe that the side compartments were sealed with caulk that has faded and cracked similar to what I was seeing on the roof. I will plan on resealing with appropriate caulk.
Also thanks to Ford for the suggestion on how to massage some more life out of the windows. I will take the tightening approach and see where it gets me.
As mentioned by Grey, my model is not the standard clamshell design and because of that, does have some vertical joints on the roof, such as where the front nose cap meets the roof piece. I don't want to disturb some sort of seal in there if not necessary. I am considering a hail mary call to the new manufacturer with the understanding that they are not technically the same company that built my unit. I am open to any other suggestions that anyone feels like tossing my way from this perspective.
Thanks for the warm welcome.