Where do people get the idea that he brought a ladder during the rally?
Even if he did, possibly the day before, a collapsible one would work. Or there was one tucked away there.
He could also have climbed the big cedar trees next to the building. Those things have branches all the way down, and the branches are tough wood.
“Where do people get the idea that he brought a ladder during the rally?”
IIRC, he had purchased the ladder that day a few hours before the rally. Home Depot or similar.
Air conditioner has been suggested.