Im finally getting around to making the roof rack purchase for my vehicle. My car has a factory rack and according to the manual the roof can hold 165lbs, I couldnt find anything in the manual about how much the rails can specifically hold. Should I go with a set up that uses the factory racks or should I attempt to remove them and run a standard set up sans factory rails? The rack will frequently be carrying two dh bikes so it needs to be sturdy enough. The racks in question are thules with the sportworks/tule trays. Does anyone know if audi facotry racks even come off without a fight? I dont want to be prying em off with a crow bar but I dont want my bikes flying off around a hair pin turn.