Iowa Code § 321.435: Motorcycles equipped with detachable stabilizing wheels.

Notwithstanding any other provision of law, a motor vehicle that is originally designed as a two-wheeled motorcycle and is modified using conversion hardware which allows for the attachment and detachment of two stabilizing rear wheels may be operated on a highway with the stabilizing wheels attached in accordance with the provisions of this chapter applicable to motorcycles. A motorcycle shall not be determined to be reconstructed based on the sole fact that two stabilizing wheels have been added as described in this section.