If you ever get the chance to spend some time in Amana,Iowa I know that you will enjoy it. We stayed at a very nice campground called Amana RV Park. It was a Passport America Park and quite big. It would be a great place for a Rally. The Amana Colonies consist of seven different villages each about one hour form the next one. By Oxen.
That is about two - three miles apart by car. Each village has something special to offer and a whole lot of history. Great stop only about six miles off I-80.
Helen