For the past eight years, a manufactured home park in Tucson has been overcharging its residents for water by hundreds of dollars. But that practice ended this summer when the Arizona attorney general stepped in as part of a broader investigation into submetering practices in mobile home parks. Now Skyline Real Estate, the company that runs Desert Haven Mobile Home Park in Tucson near I-10 and Miracle Mile, will credit residents with the money they overpaid. … Residents in master meter parks are at the mercy of an antiquated utility system with a history of overcharging problems.