Do you believe in superstitions? Did you know that when you go under the ladder, is it a bad luck in some countries? Interesting, isn't it? But they are necessary for some activities.
The ladder has the same root as a ladder. But we're back to something completely different. Do you know what a ladder is? This is a wooden car without an engine that was used in the Middle Ages. Either he was pulled by humans, a kind of cattle, or a horse. It was mainly used in agriculture, where cereals, grass, hay, etc. were transported there. Perpendicular rungs to the pedestal, or ladders, were placed on the sides of the car. It looked like a ladder.
We use small modern ladder trucks today, especially for timber transport. Forest feeders also look the same. These are also basically ladders joined together.