It is no longer easy to obtain a permit for a mobile home in Henry County. My suggestion is to look into the requirments to see if the buyer is willing to go to the trouble to obtain at best a tempory permit. A better solution would be to look at real estate with in-law quarters or two units.
Contact a local realtor. They will be happy to help you with this search. Since the realtor fee is usually paid for by the seller, you have no reason not to seek a professional to help you. It will make your life easier. They have ways of searching for properties that will address this issue directly. Good luck!