They offer a tow package. They advertise Trailer Stability Control in the X5M model introduction. They have photos of an X5M towing on the BMW website. I just checked, and have seen multiple references to 6600 and 6615 lb towing limits with the X5M.

Look in the X5M forum on this board for details on the BMW hitch (North American receiver style, in this case).

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue