You need your car moved by the 15th. A "shipping coordinator" calls you back within 10 minutes. He can lock your date today, but only with a $300 reservation deposit, sent by Zelle. So you send it. That's the trap, and it works best on people who are short on time, which is why it's one of the car shipping scams that keeps paying off for the people running it.
The auto transport deposit scam works because of how the industry is built. Most quotes come from brokers, and brokers don't own trucks. A real broker posts your car for carriers and usually takes the deposit once a driver is assigned. A fake auto transport broker skips that step. He takes your money first, and your car never gets posted at all.