Mine is an early Mattman. I've gotten used to the warts.
From the Trilliumrv site:
– Hehr has been purchased by Lippert Components
Main Site: Lippert Components
No replacement parts available from Lippert; or replacement windows"
Mine has the Hehr jalousies. Frankly, unless it has jalousie windows
on all four sides, I'm not interested. Many are using acrylic awning windows
that don't seem to open enough for good air flow. Atleast I know if I need a new door, I can buy one.
Heritage seems to be made using the same molds as mine or molds derived from a Mattman. The bottom of the doorway has the same hollowed out area as mine.