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Tennessee is not the state known for straight, flat, wide roads; especially not East Tennessee. These roads are full of other cars and trucks and sometimes even tractors.
Now, granted. I have not driven the exact drive he was on, but i have driven in east Tennessee. But, at least we had more roads then than we do now, so he had that going for him.
I don't think anyone would mistake 2-3 boys yelling at each other in frustration for the screams described. In fact, i don't know that the screams described (if they were made by a child) would carry all that far. So, the neighbors were just closer to the source (which may have been identified).
Everyone has assumed all along that CB and CH were outside when SW disappeared. Why would they be? CB said she went to help CH with her knee brace. Inside CH's camper would be a pretty good place to do this, imo.
It took CB longer than 1 hour to do laundry imo. Washing machines these days take a while to get through a cycle and jeans are slow to dry. Remember, she told CM she had "80 pairs" of jeans. Now, while that is clearly an exaggeration, it makes me think she had at least two loads of laundry.
Granted while her major appliances are doing all of that, she'd have time to do other things. Plant flowers, adjust braces, what have you.