Moving a large group of vehicles from one place to another can be done either by truck, or by hiring drivers to bring the vehicles to their destination. A reputable auto shipping company can handle the trucking, but you may save money by going through a drivers-for-hire organization.
If your business is using a relocation consultant, this person should be able to help you select the best option for moving your fleet.
You will also save money if you are willing to be flexible in the delivery times of the vehicles. If you need them all moved in, say, a single weekend, be prepared to pay a premium for deadline service.