Seats are a part of the Occupant Restraint system of the vehicle.
It is dangerous to ride in a cargo area, inside or outside of a vehicle. In a collision, people riding in these areas are more likely to be seriously injured or killed.
Do not allow people to ride in any area of your vehicle that is not equipped with seats and seat belts. In a collision, people riding in these areas are more likely to be seriously injured or killed.
Be sure everyone in your vehicle is in a seat and using a seat belt properly.