Is it difficult for a car to climb a hill or a car to climb a hill in snowy days?

This cart climbs badly. Physically speaking, friction is related to the mass of the object, surface roughness and contact surface size. On snowy days, the road is slippery. Therefore, heavy vehicles are of great help to prevent the vehicle from slipping because they increase the weight of the vehicle. At the same time, the increase of weight increases the contact area between the tire and the road surface, so increasing friction is of great benefit.