I want to take a van for 12 persons.
The Guru Take
May have to go the traditional car service or limos.
The largest vehicles that you can request through major rideshare services like Uber and Lyft are Full-size SUVs, such as the Suburban or Escalate. They fit 7 people max, not including the driver.
For 12 people, you would probably want to call a local car service or a limo.