To the OP. If the ONLY thing you will carry on the hitch is bikes, have you considered the nifty BMW rack that screws into the rear tow hooks?

Sent from my HTC Inspire using BimmerApp

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Current BMW's:
2011 535xi M Sport TiAg / Black, ZPP, ZP2, ZCV, ZCW, ZDA, 2TB, 6NR, 465, 5DL, and a Partridge in a Pear Tree
2011 X5 35D Deep Sea Blue / Oyster, PP, SP, PSP, CWP, Tech, 20" 214's

Prior BMW's
2008 ///M3 Vert
2008 X5 3.0
2007 X5 3.0
2006 X5 3.0
2006 550iA SP
2003 540iA M-Sport