Question

why does trucks and buses have Double tiles in the rear end

Answer 1

to increase surface area where pressure is decreased

Answer 2

Putting dual tires on a steering axle would reduce the ground pressure there, but it would greatly increase the effort required to turn the wheels, and would result in a high rate of tire wear. A compromise that is sometimes used is to make the front tires significantly wider than the others.
is it right pls reply