ETA: No, she doesn't own the land; her grandmother does. She may call it "family land" because it's been in the family for generations, and multiple generations have lived there at any given time; I don't know. But that's what I think of when I see her use that term. In a way, it's as if she's also claiming a right to it because she's part of that family, but no, she doesn't own it.
There's at least one single-wide trailer on the satellite view (gray roof, lower left):
View attachment 3594272
Sometimes free rent is hardly worth it, though. They'll be out in the middle of fuck-all nothing, which means driving a significant distance for shopping, medical appointments, social services, etc. They'll be completely dependent upon having a reliable car, and they're going to spend a lot more on gas and maintenance for it. While they may be on septic and a well, they're going to pay more for electricity to keep that tin can heated and cooled, and of course be responsible for all maintenance and repairs. And I don't think Meemaw and Auntie are going to be too happy when it's all ruined by cat piss and incompetence.
If Josh plans to keep working, there isn't much out there; he'd have to drive up to Muscle Shoals or Florence if he wants his pick of restaurant jobs. Hell, they've got to drive up to Muscle Shoals to get to the nearest Walmart (though there's a Dollar General down in Littleville).
Being rural poor is tolerable if you've got useful skills, a solid work ethic, plenty of family and friends, and a good reputation within the community, but neither of these two have squat. Assuming they do manage to get that trailer just liveable enough to move in, they're going to find themselves with a host of new problems to complain about that
somehow they couldn't have forseen.