Do some "Googling." I found this on the first try.
Towing capacity: 1,000 lbs
Curb weight: 4,164 to 4,302 lbs
If there's a GVWR sticker on the driver's door jam, you can weigh the car at the nearest CAT scales (with full fuel and all occupants) and subtract that weight from the gross vehicle weight rating (GVWR) to get the total payload left for tongue weight. Unless you have a transmission cooler, etc., you're probably still stuck with the 1,000 lbs. total for towing listed above. It's a luxury car - not a tow vehicle.
Rob