Ford 2005 P207 Explorer Sport Trac Owner's Manual page 411

lifting the front of the child seat. Keeping the child seat just touching the
vehicle seat gives the best protection in a severe crash.
Each time you use the safety seat, check that the seat is properly
attached to the lower anchors and tether anchor. Try to tilt the child
seat from side to side. Also try to tug the seat forward. Check to see if
the anchors hold the seat in place.
If the safety seat is not anchored properly, the risk of a child
being injured in a crash greatly increases.
2005 P207 Explorer Sport Trac (p27)
Owners Guide (post-2002-fmt)
USA_English (fus)
Seating and Safety Restraints
127