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Sounds like you have an older trailer. Think you are on the right track by thinking of residential window manufacturers as that stuff was used on aluminum frame windows as well as some wood ones. I would also call it u channel. John
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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