Before arrival, list potential additional charges and their triggers, and assign a person responsible for early warnings. Once charges arise, verify documents and responsible parties one by one. Challenge duplicate charges before payment.
In implementation, destination-country market-entry, tax, registration, and local procedures must still be rechecked under the latest requirements of competent authorities, licensed organizations, and applicable contractual provisions.
For why landed cost can exceed the vehicle price, see Why Is the Final Import Cost Higher Than the Vehicle Price?, which breaks down the main components.