I would go with the data from the X1... so they are good for 3700lbs. Seeing as the car has more grunt and I would "hope" it would be more beefy transmission and cooling capabilities and it would be insane to say it's any LESS. Transmission and cooling is really the big scare from towing. Seeing as you wouldn't be doing a huge road trip (I'd hope you aren't planning on climbing Mt. Washington with it) then you should be fine
