The vehicle stops when its K.E. is spent in working against the force of friction between the tyres and the road. This force of friction varies directly with weight of the vehicle.
As K.E. `=` work done
`=` force of friction `xx` distance.
`:. E=Fxxs or s=(E)/(F)`
For given K.E, distances s will be smaller, where F is larger, such as in case of a truck.