It’s not data from manufactured housing communities; but the company, Rent Café, does monthly reports on apartment rents around the country. The link below will show August rents in seven Iowa communities. https://www.rentcafe.com/blog/rental-market/local-rent-reports/iowa-rent-report-august-2019/
https://www.curbed.com/2018/10/16/17984616/sears-catalog-home-kit-mail-order-prefab-housing