Why do some trucks have a spare set of wheels hanging? Wouldn’t it better to just have all the wheels on the road?
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It’s called a drop axle. They are used in various applications. Often seen on vocational dump trucks. When a truck is unloaded it doesn’t need the support, so it’s lifted to maintain fuel economy and total cost of ownership (tire wear, rolling resistance, transmission and axle losses). Thre are also more common in the US in Northern states where you have lots of “Bridge Laws” that regulate the load per an axle.
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