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If you've noticed some semi-trucks now have trailers with a single wide tire per axle instead of dual wheels and tires per axle, the reason for this is that for the load a single wider tire apparently has less rolling resistance, they are sticking to the trailers on this new single large tire setup because the drivers don't like how it handles as it is apparently not as stable.
having duel axles with tires inline would give some advantage on very rough roads but for road use? I don't see it.
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