I have just purchased a 13' Bigfoot, and the first concern is that the rear plexiglas window is fogged over. Is there a supplier of new windows for these trailers, preferably a window that opens?
I don't have a specific answer for you since I had a 17-ft BF and know little about the Lil Bigfoots. But, Sunview Industries in BC is the OE supplier to BF for windows. I'd start there. They are very helpful.
I had a Lil Bigfoot which I sold several years ago.
I wish I'd never sold it.
I replaced both the front and rear windows.
I took them out and went to a plastic material distributor.
They used my windows as templates and cut new windows for me.
As I remember they total cost was about $80.00