ट्रक के बीच में दो चक्के उठे क्यों होते है? | Why do some trucks and trailers have wheels that lift?

[Administrator]

Sometimes trucks will have an axle that they can lift up – a retractable axle. If it’s on the tractor unit it’s often called a pusher axle while if it’s on a trailer it’s often called a tag axle. Retractable axles are sometimes called dead axles, lift axles, cheater axles or drop axles. These are freely rotating – they don’t have any drive from the engine...