Why is 'rearward amplification' a particular handling concern for doubles and triples combinations?

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1. It has no relevance to steering or sway at all
2. It refers to how quickly the combination accelerates in reverse
3. Rearward amplification only affects the tractor, never the trailers behind it no matter how many are coupled up behind it
4. A small steering movement at the front can be amplified into a much larger sway at the rearmost trailer

Correct!

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