Drawtite is one that I wouldn't use personally. Bolts to sheet steel at the rear pan, instead of the box sections. Also has a brace running fore/aft underneath, very visible. Also known as a Reese. Shown in this recent thread:

http://www.xoutpost.com/bmw-sav-foru...-pictures.html

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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