Chevrolet 1994 Astro Passenger Owner's Manual page 194

Towing From the Rear (Except All- Wheel Drive)
NOTICE:
Do not tow with sling-type equipment or the rear 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.
If your vehicle has the all-wheel drive option,
a
dolly MUST be
used under the front wheels when towing from the rear.
5-10