Broken rear window

Replacing the single piece of tempered glass becomes problematic due to the bastard thickness used by the window manufacturer, usually Lippert. Commercial or wholesale suppliers don't typically stock the bastard thickness so it becomes a custom/special order from day one, Uber expensive. That's why dealers go the replace entire unit route which has its own issues such as the RV and window manufacturers don't maintain stock. When the RV builder orders windows for a production run they order just enough, and the window supplier builds just enough, which is why it takes 4 months or longer unless you get lucky. You have to love the RV Industry. Folks think RV manufacturers maintain huge warehouses full of excess parts for everything they have ever built, they don't and could care less about how it effects the end user. If they have a lot of extra parts they get sold to the surplus buyers in Indiana. You just might luck out and find the exact unit by searching through those surplus guys on Ebay.