FORD 2006 Explorer v.1 - Manual (Page 167)

Your vehicle has LATCH anchors for child seat installation at the seating
positions marked with the child seat symbol:
• 5 passenger vehicle
• 6 passenger vehicle
• 7 passenger vehicle
Never attach two LATCH child safety seats to the same anchor.
In a crash, one anchor may not be strong enough to hold two
child safety seat attachments and may break, causing serious injury or
death.
Seating and Safety Restraints
167