See it. Ask the seller and arrange a viewing in Messages. Only the two of you can read it, and nothing on this page gives out a phone number or an address.
Have it inspected. A pre-purchase inspection by a mechanic you choose, before you commit. LMNM doesn’t arrange inspections yet and doesn’t inspect the vehicles it lists.
Deal in the open. Keep the conversation on LMNM, see the title and the VIN on the vehicle before money moves, and pay in a way you can trace, to a seller you’ve verified.