I think I see the crack you are talking about. Never seen that before.
Just a bit of advice though. If you want to make sure it never leaks, clean up both the front and rear seams good and apply the tape over the entire seams. I also taped around the roof vents and skylight also. I also taped all 4 slides. Across the top, down the sides and across the horizontal joints on the sides.
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2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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