My next project is a wind-powered vent which doesn't require power. I'm not sure if it will work as well as a vent with a powered fan. Next year, I'll follow-up with an assessment. With the help of mon ami Chef Renauld via Skype and US Priority boxes (previously an electrical engineer with US Forest Service), he's sent me a hole saw, acrylic rib fillers, sealant, and various drills plus a video demonstration on scrap metal, so I'm ready to go on this new adventure. Feel like an inexperienced surgeon cutting into a newborn baby!
There are only two places that sell this wind-powered vent from Germany, one is Trail Pals which specializes in trailer accessories, and the other is Wings and Wheels which sells accessories for glider trailers. I used to have a trailer and horse, and I know from experience that horse trailer stuff is more practical than RV human trailer stuff. For example, I bought and will eventually velcro a lightweight shatter-proof mirror from Trail Pals inside La Lair. I also bought Trail Pals' reflective tape for high visibility at night along the sides of La Lair. These photos were taken with a flash just after sunset so you could see how well the reflective tape (red on driver side and red and white on passenger side) works. During the daytime, the tape isn't noticeable.
Stay tuned for the vent operation!