Similar to auto-racing, experience and skill is required to maneuver the car and prevent accidents. Hence, in most cases, a professional driver accompanies the group. A group can consist of as many people as there are working seatbelts in the vehicle. Before entering the desert in an everyday-use SUV, it is essential to reduce the tire pressure. This is done to gain more traction by increasing the footprint of the tire and, therefore, reducing the downward pressure of the 4wd on the sand as there is a greater surface area (much like the head of an axe, the axe must be sharp in order to split the wood). For example, tires with a recommended pressure of 35 psi would be reduced to approximately 17 PSI.
Upon entering the desert, it is common to meet with a pack of vehicles and a group leader before proceeding. The group leader then leads the pack through the stunts in single file. The main reason for this technique is to prevent vehicles from losing track of direction and getting lost. --Wiki
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