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Why do big trucks/trailers have so many wheels?

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There are trucks that have a lot of wheels evenly distributed to carry heavy loads. But they are mechanically complex because the wheels have to steer or scrub sideways. read more

There are trucks that have a lot of wheels evenly distributed to carry heavy loads. But they are mechanically complex because the wheels have to steer or scrub sideways. So for average loads, it is better to have them in one unit to minimize wear and complexity. read more

I noticed those trucks with front to back wheels, wheels and wheels. I’m thinkiing Michigan must have massive weight allowances.. Rule of thumb is one set of wheels for approximately 17000 pounds. So if you add up the number of axles and times 17000 pounds, you will get the gross weight the vehicle is licensed for. read more

So they need all these tires to support the trailer and the trucks weight. An example is a 2003 ford ranger is about 4000 lbs. A dump truckloaded with rock weighs about 68,000 lbs . They also have more tires in some cases to distribute the load more. Meaning each tire supports a lesser amount so lesser of an impact is on the road. read more

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Why do some semi trucks have wheels that retract? - Quora
Source: quora.com