santacruzer, when you mention condensation between the Reflectix and window, I have seen a window that was a real mess from similar stuff. Over time it ruined it. Anything next to a barrier like that will have had so much condensation eventually that it makes a mess of it. Reflectix cannot take care of the problem of too much heat and not enough ventilation. In fact, it will likely make the problem worse. Of course, a pop-out would get much more air, I would think.
As First Jim mentioned, you need lots of blankets! And ventilation. And as he said, breathing is the big source of the problem. Someone gave the surprising stats on that a while back. If a microwave is available, it is good for heating water to keep the condensation down.
Also, I understand that a new trailer has materials which cause more condensation the first year, just as a new one has outgassing. May not be as bad the second year.
Cathy. Floating Cloud
"Live in the sunshine, swim the sea, drink the wild air.... "