If it's the gasket around the top of the door, this has been a problem with doors that raise up. When closing them the gasket gets rolled off of the door flange and lets water enter. I've dealt with this too and have found a way so far, going on a year now, of keeping water out. The stock gasket rests on the outward facing flange of the door frame. That's where I believe is the problem. So, I went to Home Depot or Lowe's and found this type of gasket and put it on the downward facing part of the door frame so that the door compresses the gasket when it closes. I cut out a major portion of the factory gasket, only leaving the areas about 4-6" up from the top corners to the inside. Maybe pics will help.
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2020 Montana 3790RD Legacy EditionOnan, TST TPMS, TrailAir pin, Discs,
2013 F350 DRW 4x4 CC LBViair 10007, Ride-Rites, Westin HDx, 12k Smittybilt
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