I just came back from a 7 hour trip each way, towing a 2 place enclosed snowmobile trailer with 2 sleds in it. I figure it was close to 2000 pounds.
My 2013 35i did not know anything was back there, usually 23 MPG on the highway with the trailer 19MPG and that's at 70 - 80 MPH.
The vehicle drove great, like nothing was behind me. I don't think I would want to pull anything close to max weight but I work at a local race track and see numerous BMW Club member's using X5 35i's coming in from 2 -3 hours away pulling their track cars and equipment.
FWIW
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