The department shall furnish to every motor vehicle owner two number plates for each registered motor vehicle, and one number plate for each registered motorcycle, trailer, or housetrailer. The department may, in its discretion, furnish only one number plate for each registered apportioned vehicle licensed under the international registration plan as authorized in section 39-19-04, truck tractor, or semitrailer.
N.D.C.C. § 39-04-08