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One purpose of dual rear tires is to distribute very heavy loads over a larger area. Though tires can often handle the load, they will often sink in on soft ground.

Another major advantage is that if one tire has a blowout (suddenly loses its air), the other tire will take the load and the driver won't have trouble controlling the vehicle, sometimes even able to continue driving to a service shop.

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Q: What is the purpose of dual rear tires?
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What is the primary purpose of dual rear tires?

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