A vehicle with restricted plates (including tow truck plates) doesn't require registration with apportioned plates, but you may do so if you wish. Why would you if you don't have to? Good question.
A vehicle operating with restricted plates may or may not be granted reciprocity outside of the base jurisdiction. This varies by state, and you would need to verify whether the states where you operate have reciprocity agreements in place with your base state to recognize those restricted plates.
- If you operate frequently in states that don't offer reciprocity, then apportioning may be the best option.
- If you operate only infrequently in states that don't offer reciprocity, trip permits may be the more economical solution.
If you only operate in states that have reciprocity agreements in place with your base state, then neither apportion plates nor trip plates would be necessary.