OK...I've bought a roll of Reflectix to make a cooler koosie (which worked fantastic BTW!) and now we're gearing up for 2 or 3 cold/cooler weather trips. I am naturally always cold and have 2 small kids so I'm looking for anything that will help. I have Gizmos which I will put up on the bunkends, plan on getting ceramic heaters and heated mattress pads (are these necessary??) and will also put Reflectix under the mattresses. I'm confused on what to do for the rest of the camper. I see a lot of mention on using Reflectix for the interior windows, but how does this work? Do you put it on all of the windows (2 sides and back of each bunk and 2 sides of the camper?) and, if so, how does it stay put? Does it just wedge in? Does anyone have any pics of the inside of their PUP with the reflectix in it? Thanks!!