Nice idea! I did something similar for two reasons: If I needed ventilation to help dry out or to blow warm air from the camper to help keep things warm. I put small vents in the floor at the front and rear to keep the air flowing through. I wired it to a thermostat that turns on just above freezing.
Seasonally in the Grand Marias, MN campground
On the beautiful shores of Lake Superior
2012 Ram 2500HD CTD