My roof looks the like one big piece of aluminum too. And the edges and around mounted things (like a/c and vents and such) appears to be sealed with some sort of off white (yellowish?) sealant. It's slightly soft when you push on it but not very soft.
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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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