We decided to use privacy screen material instead of film as we like to get as much light as possible in the trailer. With the privacy screens we have the option of using them, or not; a screen can be put in just one window where it might be needed. We ordered our screens from Sun and Comfort. We ordered 3 screens and cut the narrowest screen in half for the two smaller side windows on our SD Casita.
http://www.sunandcomfort.com/index.html
We attached our shades to the frames with snaps. Bill unscrewed several screws from the frame. He then placed the bottom half of a heavy duty snap on the frame and reinserted the screw he had taken out of the frame.
I took the privacy screen material, cut it to the size of the windows and then sewed sewed on 1/2" colored seam binding tape. Bill then attatched the opposite side of the snap into the binding tape matching placement to that of the snaps attached to the window frame.
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We also made insulating sun reflecting panels using the same snaps. We cut out the panels from reflective sunshades, edged them with heavy duty tape. I then sewed lines horizontally across the panels so that they could be folded accordian style. Bill attached the appropriate snap part, again aligning them to the snaps in the window from. We use velco strips to keep the panels folded and then roll them up in our curtains for storage.
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The reflective/insulating panels really help to keep the trailer warm on cold nights. Our curtains are lined with fleece. The curtains extend for several inces to the sides and below the reflective shades. The fleece adhears to the wall carpet of the trailer keeping any light from entering the trailer. This also helps to keep out any cold air that might get around the insulating panel.