If cargo door, I take it you have a tailgate rather then wing/barn doors? The only leak I ever experienced was from poorly a sealed screw on the roof rail where you attach roof racks. The dealer mistakenly fitted a full length rack at pre-delivery and never tightened one rear-most screw after its removal.
I would think that it wouldn't be to hard to run a hose over the rear door and have someone watch from inside for leaking?
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