Iowa Code Title VIII. Transportation [Chs. 306-330B] § 321.467. Retractable axles

1. A vehicle which is a model year 1999 or later vehicle shall not operate on a highway of this state with a retractable axle unless the weight on the retractable axle can only be adjusted by means of a manual device located on the vehicle that is not accessible to the operator of the vehicle during operation of the vehicle. However, the controls for raising and lowering the retractable axle may be accessible to the operator of the vehicle while the vehicle is in operation.

2. A person who violates this section commits a simple misdemeanor.