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If the trailer has antilock brakes (ABS) but the tractor doesn't,
the trailer is still less likely to swing out.
Even if only the trailer has ABS, there is less chance that its wheels will lock and it will swing out, though it can still happen. If it does, let up on the brakes until you regain control.
it doesn't make it more or less likely that the trailer will swing out.
the trailer is more likely to swing out.
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