The Ukrainian transport market is crowded with a number of scammers, so the carrier’s choice should be taken seriously.
The first is reputation and experience. You can check the reputation of the carrier through transport sites (LARDI, DELLA, etc.) and through other services for tracking registration of documents for business activities (for example, Telegram bot - Opendatabot).
Always ask for documents on the car and the driver to know who you trust your cargo. If the owner of the car and the person who provides the service do not match, then you can safely ask for a rental agreement for this car.