And don't forget that the factory hitch includes the wiring interface to plug into the factory harness, so no cutting up the harness. Factory or nothing. With the load I haul there's no way I'd take a chance with the aftermarket parts that just bolt to handy sheet metal, rather than the structural areas of the car.

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'04 E53, 4.4 Sport
'97 E39 528i
'86 911 Carrera, track car
'96 BMW R1100R