Personally, I don't think there is a set way at the factory. Ours was off both square and plumb. My friend bought a Mountaineer TT, and I don't think the top seal on the slide facing even touches the wall. And the dealer who sold it to him (used)couldn't understand why it leaked. It also was jammed so tight on the bottom, the trim facing was damaged.
To my way of thinking, the top should contact first, as the slide is free to tilt in on the top. Then, both sides should crush the seal slightly and evenly on the sides. JMHO
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