2X. Worked well on an Alaska trip (Sunset at 11:00PM!)
3X. We use the Reflectix method since we first used the trailer without it. We also have a placemat secured with Velcro that covers the door window. We found that the refrigerator lights don't bother us but keep us from tripping on the way to the bathroom.
I ordered these and they are fantastic http://amzn.to/2pV3XZj
They are also great for blocking your camera on laptops and iPads, etc so hackers can't watch you.