I don't have that problem, but are you sure it's splitting? Maybe what you are seeing is where it enters the trim piece where it meets the side, and it's lifting out from that?
Pictures would help. It's hard to imagine a new roof doing that. If it is splitting, I would definitely be in contact with my dealer to get it documented at least.
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2008 Cruiser CF26RK
2013 Ford Eco-Boost
Heavy duty payload - Max tow
135 Watt Solar Panel
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