I think it is also good for if your putting in groceries or items in the back, you just pop the top and don't need to worry about things falling out as you do with a one piece. I've have the one piece auto tailgate and when you drive around (no net) and then go to open it, if things have moved, you may see them on the ground prior to it opening fully.

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SOLD - 08 X5 (Titanium Silver w/Black Nevada with all options).