Yes, it is possible to move the driver around to different vehicles. In The Dispatcher -> Drivers -> Vehicles and change the driver to the correct vehicle of the day.
Another way to do this is by having the driver switch their vehicle. This can be set in the Drivers-> Vehicles. You can choose all the vehicles and the driver can swap between them.
Once that is done, the driver can log into their Driver App and go to their Profile-> Change Vehicle and choose from their ‘garage’ of cars.