damn, $1200 for a hitch? Rip off. Here’s a hitch and wiring combo:
http://www.ebay.com/itm/TRAILER-HITCH-WIRING-KIT-FITS-07-11-BMW-X5-75600-/400247222078?pt=Motors_Car_Truck_Parts_Accessories&fits=Year%3A2010%7CMake%3ABMW%7CModel%3AX5&hash=item5d3097ef3e&vxp=mtr
Installation should be about a half hour labor.