Still Kicking .. different direction

After a long delay because of medical reasons I am now working again on my camper. During my delay I destroyed the tear creation and headed in the direction of a "weekender." I have added some pictures in my gallery of the new trailer. I am having a little problem finding what I envision for an air inlet vent. I am trying to figure out how the fantastic fan in an exhaust mode can move outside air across me when I'm laying down. The door windows will have air drawn inside but I'm afraid it will pass above on its way out the exhaust fan. I guess I"m looking for a couple of small vents that can be opened or closed from the inside depending on the weather.
I would install them on the lower angle of the trailer about head high when lying down. I do have a recycled rv 17x35 crank open window I could install on the front vertical section but would like to explore the vent idea further.
I would install them on the lower angle of the trailer about head high when lying down. I do have a recycled rv 17x35 crank open window I could install on the front vertical section but would like to explore the vent idea further.