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This looks like a leaned up 10' Werner or Louisville brand A frame/step ladder to me (count the rungs). It's narrow at the top and widens out at the bottom. The orange ones are rated for 300 lbs, kind of heavy, and would have been noticeable being carried around.
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The 5' foldable, extension ladders are the same width on the top as the bottom, when they're set up like an extension ladder. The one I've got in my work van is a Little Giant. I also own a Werner foldable ladder. Both are aluminum, have a 22' reach, and are heavy. The Little Giant has wheels on it but they're kind of worthless on grass.
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