Chevrolet 2010 Express Owner's Manual page 68

Do not install three child restraints in the same row at
the same time and never install two top tethers using the
same top tether anchor.
Front Passenger
Position
The second, third and fourth row with three passenger
seats have exposed metal lower anchors located in
the crease between the seatback and the seat cushion.
2-44
i
(Top Tether Anchor):
Seating positions with top
tether anchors.
Second, Third and Fourth Row with Three Passenger
Seat — Passenger Van
There are two top tether anchors in the second, third
and fourth rows. To install a child restraint in the
rear driver side seating positions, use anchor point (A).
To install a child restraint in the rear passenger side
seating positions, use anchor point (B). To install a child
restraint in the rear center seating positions, use
anchor point (B). Never install two top tethers using the
same top tether anchor.