The ugly part of towing over the manufacturer's recommendation of 6k lbs max is the outcome of the lawsuit in any accident you are in (your fault or not). You're gonna have a hard time explaining how being over the manufacterer's recommended weight limit was not a contributing factor to an accident.

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Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual