Versions of Iowa Code 321.120 - Business-trade trucks on LawServer 2023 Iowa Code 321.120 – Business-trade trucks 2022 Iowa Code 321.120 – Business-trade trucks 2020 Iowa Code 321.120 – Business-trade trucks 2018 Iowa Code 321.120 – Business-trade trucks 2016 Iowa Code 321.120 – Business-trade trucks 2014 Iowa Code 321.120 – Business-trade trucks. 2009 Iowa Code 321.120 – Business-trade trucks