Leave my two vents open (2-3") all the time (driving/stored) except when camping and A/C is on. The open vents act just like the ridge vents in your home to relieve hot air, circulate what air it can, and reduce humidity build up. In your home, the soffits and ridge vents work together to do this. Not quite the same in an RV, but close. Been working effectively in my trailers for decades (FL, AL, GA, VA, and now TN). I use vent covers (Maxxair) which protect against elements except the very worse hurricane or tornado class storms.
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