I will be replacing the oldest ones over the next 5 yrs.  5 of the six were manufactured between 1969-1971. 

Need to go conventional with MANUFACTURED home (double wide after 1976) The county or city may restrict the type of foundation: pier, auger, blocks, concrete BUT it must be permanent.

Another route is to check with your local manufactured housing association.

Apart from scanning the news and paying attention to where  players like Amazon will open their next shipping hub, or Apple will re-route its domestic manufacturing plants (assuming they have any?)

For HomeReady loans, financed properties owned by a non-occupant co-borrower that are owned separately from the borrower are excluded from the number of financed properties calculation.The following property types are not subject to these limitations, even if the borrower is personally obligated on a mortgage on the property:commercial real estate,multifamily property consisting of more than four units,ownership in a timeshare,ownership of a vacant lot (residential or commercial), orownership of a manufactured home on a leasehold estate not titled as real property (chattel lien on the home).Examples — Counting Financed PropertiesA HomeReady borrower is purchasing a principal residence and is obligated on a mortgage securing an investment property.

Then in 1995 she built 2 manufactured homes (both rentals in 2021) on the land and got the property line divided into 3 sections for the 3 homes. 

Real estate syndication deals are available on multifamily properties, self-storage, manufactured home parks, land development, hotels, student housing, warehouses, and more.

I am selling my Manufactured Home that is financed as a Chattel/Home Only, and I have a contract for deed on the land with my Father-in-Law.

Check the manufacture commercial warranty.

Im looking into buying a manufactured home that is on a little over 3 acres.