GMC 1997 Safari Owner's Manual page 228

Towing From the Front (All-Wheel Drive)
I
NOTICE:
Do not tow with sling-type equipment or the
front bumper system will be damaged. Use
wheel-lift or car-carrier equipment. Additional
ramping may be required for car-carrier
equipment. Use safety chains and wheel straps.
Towing a vehicle over rough surfaces could
damage a vehicle. Damage can occur from vehicle
to ground or vehicle to wheel-lift equipment. To
help avoid damage, install a towing dolly and
raise the vehicle until adequate clearance is
obtained between the ground and/or
wheel-lift equipment.
Do not attach winch cables or J-hooks to
suspension components when using car-carrier
equipment. Always use T-hooks inserted in the
T-hook slots.