* The vehicle's sticker: Look for a sticker on the driver's side doorjamb or the glove compartment. This sticker will list the GVWR.
* The owner's manual: The GVWR is usually listed in the owner's manual.
* The Ford website: You can potentially find this information by entering the VIN number on the Ford website, although this is not always guaranteed.
Without knowing the exact configuration of the van, it's impossible to provide the GVWR.