Question

Why engineers have preferred to use six or eight wheels for heavy vehicles?

Answer 1

In a heavy truck, each wheel has to support large road and the pressure on the road due to each wheel is large.
Since, pressure = force/area
Using of extra wheels reduces the pressure on road due to each wheel. This prevents the wheel from causing damage to the road as well as sinking into soft ground.
This is why, extra wheels are used in heavy vehicles.

harshavardhan answered this

 because larger area of wheels , less pressure will be there ...
harshavardhan answered this

heavy truck is fitted with 6 to 8 wheels ......so that pressure will decrease and road will not sink

harsha :)

Answer 2

if there were only 2 or 3 wheels in heavy vehicles then the goods fall down so engineers have preferred to use six or eight wheels for heavy vehicles. please mark it as brainliest pls pls.