Chevrolet 2003 Avalanche Owner's Manual page 139

Use the art and following instructions for the proper
storage sequence and location for each panel:
Panels 3, 2, 1 Loaded
2. Starting with cargo panel 1 (the panel with four
latches) load the cargo panel with latches facing
outboard (side of panel with no latches should
be facing you as you load the panel).
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