Lots of discussion if you do a search on tow hitch.

The basics:

There is no factory tow package. No additional coolers available or required.

Your vehicle was rated to tow up to 6000 lbs, with up to 600 lbs tongue weight, when using the OE hitch, which was a dealer-supplied accessory. Over 1600 lbs trailer weight (IIRC) requires trailer brakes.

That hitch is stronger than any of the aftermarket hitches due to the way it mounts to the BMW unibody structure. It is not likely to still be available, so you have to find what you can.

Whatever you do for a hitch, you also have to address trailer wiring. The cleanest solution is the OE wiring kit, which came packaged with the trailer hitch kit. It not only supplied wiring for the trailer lights, but it disabled the rear PDC and allowed the DSC to access a trailer stability control mode if the vehicle detected trailer sway. There are simply wire tap systems for trailer lights. Some have been known to interfere with the on board Lighting Control Module, others have been fine.

Jeff

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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