The reason is to understand what X5 you have. Nobody wants to come to your home. Put another way, is your X5 a US spec vehicle? And what year is it? While I understand your desire for privacy, the lack of that information makes the data you are requesting far less valuable.

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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