HA HA My days of getting up at the "crack of dawn" because the kids are up are long LONG behind me... Even the grandkids are in their teens and sleep late
As for putting a curtain rod, or an aluminum light block on the window. If you want to take it off, you have to open the door, separate the screen and pull it off. Although it is not a big deal, if it's raining and you want to get more light in, or if it's really "buggie" in the campground, who wants to open the door, just to install a light block???
I like the idea of a towel over the door header. It's done inside, no need to open the door and easy to remove if not needed.
We had a pull down pleated covering on the doors in a Holiday Rambler we had. What a pain in the %*& they were. We finally quit using them and just started hanging a hand towel over the inside of the door header.