Chevrolet 2004 Silverado 1500 Pickup Owner's Manual page 342

4-52
{
CAUTION:
These hooks, when used, are under a lot of
force. Always pull the vehicle straight out.
Never pull on the hooks at a sideways angle.
The hooks could break off and you or others
could be injured from the chain or cable
snapping back.
Notice: Never use recovery hooks to tow the
vehicle. Your vehicle could be damaged and it would
not be covered by warranty.