GMC 1997 Suburban Owner's Manual page 281

The recovery 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.
I
NOTICE:
Never use the recovery hooks to tow the vehicle.
Your vehicle could be damaged and it would not
be covered by warranty.
5-41