Why does the tanker (give the gas station a gas station) the rear wheel is a single wheel, a truck head in front, a three row of wheels behind the tow (oil tank), each row should be
PS: singleton is mainly used in the lightweight car, for example, used in Aluminum Alloy semi-trailer tanker on single tire, suspension and single supporting axle and air, this can greatly reduce the weight. A 50 cubic meter aluminum alloy semi trailers, weight can be controlled at around 7.2 tons, the same volume of carbon steel semi trailer weight at least 9.5 tons.
Oil tank is because the density of finished oil is not large, so overloading situation is not too severe, but also with a single tire, reducing the vehicle's own weight, so that once you can Dora part of the oil, is also a good choice.
Now, some semi trailers, in order to reduce the weight of the car, choose to install a single tire (single tire is more wide than the twin wheel, more carrying capacity), as long as the overload is not particularly large, a single tire is also possible. Moreover, single tires are generally used for road transportation (better road conditions). If your car is in bad condition and overloaded, the twins are better than the single tire.
