I'd consider some sort of drain in the bottom of the attic. My coach they used the wrong kind of clearance lights and they allowed water into the cavity and it sat on the top of the bottom of the overhang. It percolated through the aluminum a bit. I put in different lights and I also store mine inside so I haven't had a problem since. But I should probably figure out how to put some sort of drain fitting up front there on the bottom to allow water out if it gets in there. My philosophy with water is usually "it's going to get in there no matter how hard you try to keep it out, so do something to get it out as efficiently as possible."
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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