If it has Azdel vs Luan , it should state it in the exterior of the trailer .Im that familiar with North Trail but I do not think Heartland was using this product in 2017
Usually there is a sticker on the outside wall of the trailer. Should be on the left side of the entrance door.If there is no sticker or signs that one was there,than I would say the wall has a Luan backer.
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