When the vehicle encounters deep snow, the wheels sink into the snow, and the car cannot go any further. In order to be able to continue driving, chains have to be put on the wheels, but if the snow is too deep, then the bottom of the car lies on the snow, and then the chains don't help either.
For vehicles that often have to drive in deep snow in winter, this problem could be solved by placing one long ski under the car, which is at least a meter longer than the vehicle it is under, as shown in the picture above.
The car (1) has one long ski (3) attached to the bottom. The ski (3) is attached to the car (1) with two elastic bands (5) from the front and two elastic bands (5) from the back of the car (1). These elastic bands (3) hold the ski (3) firmly against the bottom of the car (1). On the skis there is a solid canvas balloon (4), which was deflated when it was placed on the car (1), and takes up very little space.
When the car(1) encounters deep snow then the wheels(2) fall deep into the snow and the car(1) cannot drive any further. Air is then blown into the cloth balloon (4), and the ski (3) descends towards the ground under the pressure of the cloth balloon (4). When the ski (3) touches the snow surface, the canvas balloon (4) starts to lift the car (1) upwards, and the pressure of the wheel (2) on the snow surface decreases. This causes the wheels to partially lift up, and the resistance of the wheels (2) breaking through the snow is significantly reduced. This transfers the weight of the entire car (1) to the skis (3), which have much less resistance to movement through the snow.
Such skis of different lengths could be placed under all vehicles such as cars, off-road vehicles, trucks, or military armored vehicles. In addition to moving on deep snow, skis could also be used on vehicles moving on swampy ground with deep mud.