You cannot find a single definitive answer without knowing the specific details of the van. To find the precise towing capacity for *your* 2002 Chevrolet Express Cargo, you should:
* Check the sticker: Look for the sticker on the driver's side doorjamb. This sticker lists the vehicle's specifications, including towing capacity.
* Consult the owner's manual: Your owner's manual will have a section detailing towing capacity and other important information.
Without this information, any number I could give you would be inaccurate and potentially dangerous.