Yep, the venting is a pain.
However, we never had trouble with battery drain even after several hours. Besides, if we were going to leave the HiLo/Vehicle, we just raised the thing, (used the potty), started the fridge on gas, or switched to internal trailer battery (disconnect tow vehicle plug) and were happy.
I do agree that venting would be appreciated - but really, we never had hassles with the fridge.
Good luck
Traveler
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