Why can two trailers with the same length but different wheelbase spacing off-track differently in the same turn?

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1. Off-tracking depends only on the trailer's total length, never on where along it the axles happen to sit
2. Two trailers of the same length always off-track identically
3. The distance between the trailer's kingpin and its rear axles changes how far the rear wheels cut inside the tractor's path
4. Off-tracking is determined solely by tire brand

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