I think a better bet may be a couple climbers. I watched Len and his boy from the time he was 11 carry in their climbers and shimmy up the same tree. In the beginning they went up the same tree, one behind the other. They'd sit one above the other on opposite sides and watch their zone. After a couple years they did it 30 or 40 yards apart and stayed in touch with radios. Now that Len's boy is 15 or 16 they discuss where they're going and head out alone. His boy has years of experience with his safety vest and treestand and is pretty much self sufficient in the woods, and safe.