Include water pooling in right or left rear storage "pockets", water pooling in spare tire area (under back deck removable lid), wet areas inside on the carpet near the back tailgate and/or dripping water from the inside top plastic pieces between the headliner and tailgate opening.
Body top and side pinch welds under roof top rain gutter (most likely)
Roof Rack rails eroded grommets
Rear tail gate wiring grommets
Antenna on roof
Rear tail gate and/or window rubber molding (least likely)
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