Iowa Code § 321E.32: Movement of structures and other loads on dolly axles.

The movement of structures and other indivisible loads on dolly axles shall be subject to the same weight limits that apply to all other indivisible loads. However, when an indivisible load is moved and the transverse dolly axles under the load have a clear inside spacing of five feet or more, each axle shall be considered a separate axle in determining the axle weight limitations provided by law.