Smoked acrylic is pretty standard stuff. If you don't mind cutting it yourself you can get 24x36 from Amazon for $40; many window glass places also have acrylic and will cut to size; there are specialty plastic stores - on the West Coast the best is TAP Plastics with I think 17 stores. You could also use tempered glass, which is what my (a foot less in height than yours) Lippert door window has.
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2022 Jay Feather Micro 166FBS
2019 F150 SuperCrew Short Bed 2.7L
Andersen WDH, 1000 lb Sumo Springs
Past: 2015 Winnebago View, 2004 Blue Bird M380, 1990 Blue Bird WB40, 2003 Safari Zanzibar, 1998 Safari Sahara
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