Joe, I've not gotten up to measure mine but it looks like a tiny, almost imperceptible, drop to the outside on my slides. Just giving a quick glance they appear to be square with the sides but if you study them it does look like a tiny drop. Thinking about it, I would assume there would be some sort of drop so you wouldn't have water trying to run up under the seals any time it rained; instead it would flow away from the seals hopefully eliminating the possibility of the water finding a way to slip through a gap in the seals and find its way inside.
Another thought is that I believe my slides, when retracting or extending, always have one end or the other start/end before the other indicating there is a slight difference in the way the slide is held by the cables. That is also indicated by 2 of the cables being very taught and 2 more loose in either position. So, I suspect it is normal. My bigger concern is that the difference wasn't so great that when the slide was retracted that the top did not seal tight against the upper seal.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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