The circle wading technique has many advantages. Everyone forms a circle holding on each other's shoulder straps. As you cross the stream, spin the circle so each person takes their turn at the most upstream position. If someone loses balance, they have two people that can lift back up quickly. Inside the circle is a very protected area where you can place the victim. Here is a video demonstrating this technique: Circle Wading Technique. One caveat just like the two person wading technique, the upstream person is facing downstream and must be real careful with foot placement to avoid foot entrapment.