AKat, I don't have any roof vents on my rig. If I want fresh air, I just open a window. If I want cool air, I turn on the AC. I'm all about simple, even to the detriment of fancy.
As far as ac/dc, I run most everything in the living space on AC power and the generator pumps plenty of 12V to keep the truck batteries charged for the 12V lights and water pump. Remember that the toilet is waterless and I have AC, LED, house lights when on shore power. I don't use much 12V power unless I'm driving.
*side note* check your batteries BEFORE you go on a trip. I didn't on this last trip and it cost me $400 to replace 2 stupid batteries. If I had replaced them while still at home, I could have used my normal repair shop and that would have only been $260. So I paid my "stupid" tax.
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Doc Weaver '98 Freightliner FL60 pseudo toy hauler
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