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This seems to be something people don't always give second thought to. When people talk about the homeless, the first things thought about are images of people on busy city streets in rusty clothes waiting around near allies. In there, the answer is quite static, because it can be I guess. But if that's the case, change the setting and that changes too. In the places where I've lived, people often needed that mapped out. Where are they known in your rural locales?
You say that like rural areas don't have crop fields.
In all seriousness, I know enough about it to know it's not too different. Dumpsters and trash cans can be found anywhere for example, though they're not great sources of food in either place. I was once an anonymous rural example, but it's for that reason one could look at me and say they don't think we exist in rural areas. I was lucky enough though to couch hop. Others found solace under a local landmark, but not all rural areas have those, though they might have other things. I felt bad for one who asked me for a ride since I don't drive.