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Absolutely stay OEM. No comparison to the aftermarket hitches. Yes, it costs more. Easy home install with hand tools, takes four hours.
You MAY have to have the vehicle coded after installing the wiring module. By design, it is plug and play, but often the vehicle (especially post 2004) does not recognize the module. You will know, because the rear PDC won't disable when the trailer is plugged in, and the lights may not work on the trailer. The recoding is to get the vehicle to recognize the module, nothing more. It should cost an hour at a dealer, if required.
Whether or not the vehicle recognizes the module appears to be based on the consist of what modules are on the vehicle. Some have worked, some not. Prior to 2004, there was no coding requirement. You won't damage anything by trying; if it doesn't work there is no harm, no foul, just get it coded.
Note that the trailer wiring module is a separate device to any brake controller you may require.
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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
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