I can't get out of my car; can someone bring me a ballot to vote from there?
Yes. If you are unable to go inside the polling place a team of election workers will be sent out to your car to help you vote.
Can an independent vote in a primary election?
Yes and No. In Iowa, you must be a member of a political party (in 2020: Republican and Democrat) to vote in a primary election. However, anyone can change parties on Election Day and vote. For independents to vote they must declare a political party.