[Nebster]

I just re-sealed six windows at 10 years. All but one of them were skinny vertical windows, so I think something was up with the factory that week when they made that particular size.

Newell does not recommend slide seals or air bags to be replaced preventatively. Mine are still all original.

The other stuff you listed is a drop in the bucket, relatively speaking (except brake chambers, which I don't know a thing about and hope I never have to).

I've noticed a lot of other rubber-y things aging out on my coach: gaskets, trim pieces, slide wipers. Some of those can be very time-consuming and/or expensive to replace.

Think of it like a game. It's more "fun" that way!