See also:

Remove attached partsfollowing use
Remove auxiliary mirrors, roof or rear luggage racks which are no longer required following use. Attached parts on the vehicle impair the aerodynamics and increase the fuel consumption. ...

BMW X5: lower tailgate
Opening Opening Pull the lever and swing the tailgate downward. The opened tailgate can be loaded with up to 550 lbs/250 kg. Closing Fold the tailgate up and press closed. ...

Emergency unlocking
Pull the handle inside the cargo area. The trunk lid unlocks. ...