Venting

Has anyone used dryer vents on the side of the trailer instead of the roof? Our vent at home is a white pvc one with louvers that would keep the water out 
I have a source for some bigger computer fans (free to me) that would work great on the inside of the trailer and I was thinking this might keep the holes out of the roof.

I have a source for some bigger computer fans (free to me) that would work great on the inside of the trailer and I was thinking this might keep the holes out of the roof.