Red flag
A red flag is a warning you can check before the car moves. The short list is price, deposit, authority, names, and payment. One failure is a reason to stop. The linked pages explain what to do next.
Use five checks, in this order. Price: a quote that sits alone, far under the others, with a push to pay today. Deposit: a large sum due before any carrier is named, to a company the contract does not describe. Authority: a USDOT or MC number that is not active, for the right role, on the day of pickup. Names: the ad, the contract, and the truck disagree, and nobody explained the difference or gave you the new docket. Payment: a personal app, a wire to a stranger, or cash above the contract. The matching pages are too-low quote, upfront deposit scam, inactive authority, and name mismatch.
How to use the list
One yes is a pause, not a debate. Look up the docket yourself. Read the cancellation line before you send money. Refuse a pickup that has no bill of lading. You do not need all five to be wrong.
What RideShipper will not do
RideShipper can show a range and point at public records. It cannot clear a company that fails the list, and it cannot get the car back. The company with the truck is the one you have to identify before the keys move.