pass through window use?

My camper has a window in that location but it is a one piece and does not open. I still like it as in my truck and camper I can still see from the center mount mirror through the camper and out the back door. Our camper does not have a slide so no interference from it. We also have one of those stick on fish eye setups on the camper door window. I would like it to operate for air flow down low but then I hear of problems with them leaking while driving in rain.