To find the towing capacity of *your* specific 1991 Chevy G20 conversion van, you should:
* Check the owner's manual: This is the most reliable source. The manual should specify the towing capacity for your van's configuration.
* Look for a sticker: Check the driver's side doorjamb or the glove compartment. There may be a sticker listing the vehicle's specifications, including towing capacity.
* Consult a Chevy parts dealer or mechanic: Providing them with the VIN (Vehicle Identification Number) will allow them to access the original specifications for your van.
Without this specific information, any number I could give you would be unreliable and potentially dangerous. Never exceed the recommended towing capacity for your vehicle. Overloading your vehicle can lead to significant safety hazards.