Isn't there a product called ERWIN that is supposedly a straight replacement window for the door for many RV doors. It's a real openable window instead of the frosted window that comes with most.
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Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips