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Ordinary cargo semi-trailers have received the attention of manufacturers and users since 2000, and have rapidly increased their temperature until fever. In the past 10 years, semi-trailers have run wild like wild horses and their production and sales have made great strides. At present, the number of semi-trailers in China has reached 2 million, making it the main model of road freight.
In 2011, the demand for semi-trailer turned sharply, and the market conditions quickly changed from being prosperous to disinterested. The market trend sent a clear signal that the semi-trailer ran at a high speed for 10 years. It should return to the economic speed track.
No matter how good the product is, the better, but there is a balance between supply and demand. Before and after 2005, the market demand for semi-trailers in the country was similar to that of the sea, but at the time there were fewer manufacturers and the production quantity could not meet the market demand. There was a situation where manufacturers had to sell cars and vehicles could make money.
In the following years, many production companies set off a semi-trailer fever based on the irrational judgment of an infinite demand for the semi-trailer market. From the initial seizure of the opportunity to invest in the semi-trailer, gradually evolved into a semi-trailer factory across the country. In places where semi-trailer plants are concentrated, under the strong promotion of the local government, there has been a big leap forward in the construction of new semi-trailer plants. Between the original semi-trailer plants, a major expansion of capacity expansion was also launched. 
Due to the low technical content of ordinary transport semi-trailers, the production process does not require much expensive tooling equipment and the production process is relatively simple. As a result, in that passionate period, the low-end products such as ordinary semi-trailers were mass-produced in large-scale factories with relatively complete equipment. The small-scale factory tooling equipment was poor, and it was still produced as small-scale production as a workshop with stalls.
In the year of strong sales, the total sales of semi-trailers nationwide does not exceed 300,000. Through 10 years of large capacity expansion, the current national semi-trailer total production capacity is estimated to reach 600,000 units. The vicious competition escalated, and the semi-trailer who rushed for 10 years slowed down.
Compared with conventional ordinary freight cars, semi-trailers do have the advantages of large car trunks and more cargo loads. In the case that the state’s measures for overloading and overloading are not perfect, and the implementation is not in place, the hope of semi-trailer users to earn more money by holding Dora has joined the ranks of semi-trailer trucks. After these users made money, their demonstration effect led to a large number of people who wanted to get rich through running freight to rush to buy semi-trailers. In urban and rural areas and in many towns and cities in some cities, a large number of specialized households and professional villages that drive tractors towing semi-trailers have emerged, forming a large user group.
In previous years, it was not uncommon for semi-trailers to pull more than 100 tons of coal and more than 100 tons of steel. It was during the specific development period that Dora was able to make big money and drive the semi-trailer market through abnormal transportation methods. The market has pushed the peak of production and sales.
At present, under the background of rapidly declining market demand, production companies should use this opportunity to reflect on how to change production methods and sustain development in a new market environment.
National production and sales of semi-trailers rushed for 10 years. In 2011, demand turned sharply and returned to calm.