Stop in Winterset, Iowa. It's where they filmed "The Bridges of Madison County". There are eight covered bridges,seven of which are within bicycling distance of town.
A great rv park in the city park for $17 a night FHU. Very quiet, corn field out the front and typical mid America town with a town square with city hall and court house in the town square. Dime store, drug store. VERY friendly people. We were going to spend one night and stayed a week.
It has a world class aquatic center that was packed all day, every day.
Winterset is also the birthplace of John Wayne.
A nice, neat, clean, friendly, prosperous little town well worth seeing.