I don't understand the relationship with no roof rack and having a panoramic roof. It isn't like the rack actually touches the glass in any way. I find the sunroof to be very handy for keeping an eye on the bikes, to see if they are moving around too much at highway speeds. Our bikes are a little pricey, and I wouldn't put them behind the vehicle due to risk of damage from impact, and the high amount of dirt and grit that is drawn into the low pressure zone behind the vehicle.

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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