You don't say what model trailer you have but I would think that you are getting some form of condensation between the ceiling and the roof. You may be able to remove the marks with "Mr Clean Magic Eraser" but they will most likely come back if you can not find and eliminate the source. Some higher end models have "Attic vents", perhaps something like this would help. Removing the interior trim from a roof vent may allow you to look into this space and help diagnose the problem. Let us know what you find out, Hank
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Hank & Lynn
2007 Cougar 290RKS, E-Z Flex, 16" XPS RIBs ( SOLD .. Gonna miss her ... looking for new 5r)
2004.5 Dodge 2500 QC, LB, 5.9HO, WestTach gauges, Ride-Rite
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