BED TIME!
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IIRC if it's a private vehicle (i.e. not a for-hire charter van, school van, church van, etc), you can legally carry 15 people without a CDL. However, if it's on a for-hire basis, the magic number becomes 10...more than 10 people and you need a CDL with pax endorsement.
The 12 pass configuration may get some dot looks???