Never owned a RT, but I've had my share of leaks in previous vans. My advice is don't assume that the leak is anywhere near the point at which it is manifest. A roof leak often travels above the ceiling for a long distance before finding a path downward. Pay attention to the pitch of the ceiling when the van is parked in its normal spot.
Also, any penetration should be suspect. I once had a leak that I traced to a small outdoor porch light. Take down the fixtures and make sure all holes are well-sealed.
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Now: 2022 Fully-custom buildout (Ford Transit EcoBoost AWD)
Formerly: 2005 Airstream Interstate (Sprinter 2500 T1N)
2014 Great West Vans Legend SE (Sprinter 3500 NCV3 I4)
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