I have completed several FHA manufactured homes appraisals lately and problems usually arise with the hud requirements to have a permanent foundation.   HUD now requires an engineers report on all FHA manufactured home foundations. So if you contract a manufactured home going through HUD or FHA,  get the foundation inspected. (It would be best to get a engineers report on the foundation when you list the property). Getting ahead of the ball would save time and many problems when trying to close the property. Here is a the link to HUD foundations for Manufactured homes. If you have any questions you can email me through this web site.