Question

trucks and buses have Double Tyres at the rear end

Answer 1

They have double tyres to increase surface area so that the pressure will decrease on the road
Hope it helps u
Thanks ✅

Answer 2

hey mate here is ur ans
trucks and buses are vehicles designed to carry more load
the engine is at the frontal side and more load is on the rear side of these vehicles whether goods or passengers so to withstand more pressure the tyres at rear side are doubled Which increase area of contact thus reduce pressure (P is inversely proportional to area)

hope it is not wrong and helps you