No need for either self-levelling suspension, or sport package. I towed with a 3.0 and it handled fine.

Also, if you are considering a 3.0 manual I would look for a later model 6 speed, '04 onwards.

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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