Why are heavy trawlers fitted with a large number of wheels?

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Solution

We know, Pressure= Force / AREA= F/A
So, the greater the area of contact between two surfaces, the lesser will be the pressure.
So, the load-carrying heavy vehicles have a large number of wheels so that the pressure on the road is reduced due to the larger contact area.
Also, using a large number of wheels ensures that the force due to the load is shared among the tyres and no single tyre is under stress.

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