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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Those wheels exist to support added weight within the trailer. When deployed they will also increased “drag” and, therefore, fuel consumption. While this increase may not be a large amount for an individual vehicle or trip, when you multiply that small number across an entire fleet, it becomes a sizeable amount.
Spoke with a fleet driver once about the aero skirts that are now prevalent on so many trailers. He said they were told it added roughly 1% to their fuel efficency. Now multiply that savings across a fleet of a thousand trailers. And there you have it.
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