I was having a conversation with a fellow off-roader. They were adamant that you should always keep the person behind you in sight. Probably okay on a trail, but not the safest strategy in the dunes. This lead to a lengthy debate.
In our group, the lead car and the last car are always in radio communication. Together, they keep track of the group. That way, everyone is focused on whats ahead, and no one is looking behind them. If someone falls behind, the last car radios the leader, and we stop to gather up again.
Am I wrong about this? How do you keep track of your group?