You may find yourself using temporary transportation for jobs that pop up. You can keep your tracking needs met by installing a spare Raven in a rental vehicle as you would for your regular fleet.
By moving a Raven from one vehicle to another, a new vehicle in the Raven app will be created, which will then automatically create a new vehicle in the Kahi app. This will leave the previous vehicle with no gateway. You may have to update the names accordingly as the Raven moves from vehicle to vehicle.
Don't forget to remove the Raven before the rental goes back!