Chevrolet 2003 Astro Owner's Manual page 209

'he following chart shows how much your trailer can weigh, based upon your vehicle model and options.
Two-Wheel Drive (Passenger)
Maximum trailer weight is calculated assuming the
driver and one passenger are in the tow vehicle and it
has all the required trailering equipment. The weight
of additional optional equipment, passengers and
cargo in the tow vehicle must be subtracted from the
maximum trailer weight.
You can ask your dealer for our trailering information or
advice, or you can write us at the address listed in your
Warranty and Owner Assistance Information Booklet.
In Canada, write to:
General Motors of Canada Limited
Customer Communication Centre, 163-005
1908 Colonel Sam Drive
Oshawa, Ontario L I H 8P7
4-34