I don't know where in the "rural southeast" you are, but GA passed a law last year allowing the owner to convert a mobile home to real property and thus be part of the real estate instead of titled. With 3 MHs on 1 parcel it sounds like rental property instead of a private residence so that probably hasn't happend, but I would ask the customer to be safe.
"Once you learn to read, you will be forever free."
- Frederick Douglass
My Opinion Only.