I ran across this proposal from Iowa to Electrify America (VW) in which they did outreach to find sites interested in hosting level 3 charging stations. One of the sites was Dows Junction, a truck stop on I-35 which is just about the only suitable site in the area. Since Dows has a Coming Soon pin on Tesla's Find Us map, I called them up. The manager of Dows Junction said that they had an agreement with Tesla in place, and she thought construction was supposed to begin in April but it hasn't started yet.
Dows Junction
904 Cardinal Avenue
Dows, IA 50071
Map
Dows Junction
904 Cardinal Avenue
Dows, IA 50071
Map