theoldprof
Veteran Expediter
I had a roof vent fan on my van with a goofy looking hood over it that protected it from the rain. I could drive or sit in pouring rain with nary a drop coming into the van. My van looked like a shark with a VERY fat fin, but it kept the rain out. Fan would take air in as well as exhaust. Got it from a camper/motorhome supply place.