No you don't. You need 5 people in a car, coming into a state, and then going from poll to poll from morning til evening.
At the first poll, a passenger says she's Emily Smith, votes, and gets back in the car. She is then driven to the next poll ten minutes down the road, where she says she's Suzie Jones, votes, gets back in the car, and goes to the next poll. A car full of people can probably vote in 20 to 30 different locations over the course of election day, depending on how crowded the poll is and how far apart they are.
In that case, that one car full of people can cast 100 to 150 votes in a day. And if there's early voting, they can do MANY more votes.
You are so right. So one car with 5 people each thousand could cast 150,000 vote each day.