Protecting Manufactured Homes from Floods and Other Hazards: A Multi-Hazard Foundation and Installation Guide [open pdf - 15MB]
"This revised edition of FEMA 85 provides new recommendations for manufactured home foundation design and installation. The initial 1985 edition of FEMA 85 provided guidance on installation methods designed to make manufactured homes less susceptible to damage caused by flood and wind events. Significant advances in design and construction technologies, mitigation strategies, and regulatory requirements since 1985 have all contributed to the need for updated guidance."
FEMA P-85, Second Edition
Federal Emergency Management Agency: https://www.fema.gov/