Hi. We have have a window behind our bed that is just a window, it doesn’t open. On the outside of the window it has a flap that can open to allow more light into the trailer, the extra light isn’t needed. What we would like to do is permanently board up this window from the inside and seal the outside flap with silicone, or some other type of sealant so rain and water does not get in to the trailer. We are thinking of using insulation board over the window and then use some type of decorative board to make the entire wall behind the bed aesthetically pleasing. do you think that this is possible without causing moisture issues in the trailer? Our trailer is parked in an area that has harsh winters -30°C and very warm summers 34°C. Please, any help or suggestions are welcome and needed. Thank you.