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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In addition to what others have explained they can also be used to improve stability in slippery conditions by redistributing the weight balance of the truck. You can for example lower them extra low to increase weight on the front wheels to give them more traction to steer better. Lifting them will put more weight on the rear drive wheels (if the truck is loaded evenly) to give them more traction up hills and such.
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