From Property Sidekick:
Park Sidekick Mobile Home Park Software is the easy and complete computer software solution for managing mobile home parks and manufactured housing communities.
Automatic billing, metered utilities, site map, complete tenant and property information, easy payment collection, complete accounting and reporting, remote access capability, and security settings to track user activity. It includes latest technology with SQL database, easy to use, and modern interface.
One time purchase. No recurring monthly fees.