Exchanges have redundant axles that move over and down depending on how important weight is on the truck. exchanges will lower the axles when loaded to reduce pressure on the road as the cargo is spread out over further axles and tires. On exchanges similar as concrete mixer exchanges, these axles look like campers hanging off the reverse, and they're only lowered when the truck is loaded. Other axles, similar as on large dump exchanges, are in the middle of the truck and only move over and down. There are also large busses that have what are called “ label ” axles in the reverse, these are single tire axles that move over and down and turn when the machine is making a tight turn, allowing it to initiative in tight spaces. That's how those busses navigate inner megacity thoroughfares and business with similar ease, they steer from the front and reverse. Some technical exchanges have hinder steer axles, similar as fire exchanges. For exchanges, it's each about weight distribution. For the same reason, when you see a heavy haul truck and caravan there will be numerous further axles than normal, all according to the cargo on the truck. When you see a caravan with further than the standard two axles, that's also to allow the caravan to haul redundant weight, similar as a milk tanker truck. still, they remain down all the time rather of moving up and down.
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