I have thought about this in the past as this would possible even out the air flow a bit so it wasn't just drawing towards the one vent. However, I have never had an issue with just using the single vent so I figured I would not risk jacking up the lid to install a second.
Proud owner of the PentaZero
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UDS/WSM/Weber Cart for sale Here. Please someone give it a good home. Willing to entertain offers