* The vehicle's sticker: The original window sticker (Monroney label) will list the curb weight.
* The owner's manual: This manual should also specify the curb weight.
* A reliable online resource: Websites specializing in vehicle specifications, like Edmunds or Kelley Blue Book, may have this information if you enter the specific details of the Grand Caravan (engine, trim level).
Without that specific information, I cannot provide the curb weight.