The record that campaigns run from is the vehicle
Most marketing tools are built around a person. A dealership that organises its messaging around a person rather than a vehicle loses the ability to say anything specific, and specificity is the entire advantage automotive has over other retail. You know what the customer bought, when, in which variant and colour, how far they have driven it, when the insurance lapses, when the warranty ends and when the next service is due. A message that uses those facts reads as service. The same message without them reads as spam, and it will be treated accordingly.
So the practical starting point is not a campaign builder. It is getting the vehicle record right: registration number, variant, delivery date, last odometer reading from the workshop, insurance expiry, extended warranty end and any maintenance contract. Almost every useful trigger in a dealership derives from one of those fields, and a dealership with clean vehicle data and a basic sending tool will outperform one with a sophisticated tool and a customer list.