Factory sunroofs do have drain tubes that can get clogged causing leaks but they are easily cleaned out if you re aware of them.
Nissan titan roof leak driver.
Nissan had an issue with that from the first gen titans as well.
After raining for a few hours i found water in the driver side floor mat.
What i did was bought some factory paint in a tube with clear coat on top of the cab with your roof moldings off take the paint and follow the line to the rain channel and take some black sealant inside and outside of the rivets.
I know for a fact that nissan has covered this issue on some of the first gen titan s.
All nissan did was glob on some black sealant it took them about 3 tries and then i had to fix it.
That seam sealer shrinks up and the paint goes with it.
14 but that s just the start of what the titan offers to help keep the driver and passengers safe.
What you are likely seeing is the seam sealer that covers the seam where the roof overlaps the outer roof rail panels.
Each trim in the titan lineup features eight standard air bags including front seat mounted side impact supplemental air bags and roof mounted curtain side impact supplemental air bags with rollover sensor.
Cutting a hole in the roof in my opinion has nothing to do with reducing structural integrity in a vehicle.
Nissan usa official site.