Graco Smart Seat Owner's Manual page 28

NOTE: Some vehicle manufacturers have lower maximum weight ratings for LATCH
anchors, so you must consult your vehicle owner's manual or call the
vehicle manufacturer to confirm the limits on your vehicle's LATCH anchors.
Use vehicle belt (not LATCH connectors) for installations with children weighing
more than 48 pounds (21.7 kg).
Typical seat in a
passenger vehicle.
Other vehicle types
may have different
locations.
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