Rise in Price of Semi-trailer in China
The reason of rise cost in raw materials(steel and parts)

On 6th,April.In the largest national-level inspection on record, more than two dozen cities in north China will face a strict one-year inspection over air pollution prevention.About 10,000 polluting companies were ordered to suspend production or shut down by the end of June.
The seventh round of the year-long strict inspection on air pollution control had been completed by July,20th.It affected including:the rubber and plastics manufacturing, machinery manufacturing, coating and spraying, plywood, packaging and printing industries.
So what is the uniting factor for these diverse commodities？The environment.
With the government putting pressure on inspectors to shunt down polluting factories,mines,and processing facilities by September.
The price of raw materials(steel and parts of semi-trailer) is rising affected by environment renovation in China.
And China will soon launch a new round of central environmental inspections covering eight provincial-level areas,including Jilin, Zhejiang and Shandong provinces.
As the reuters reported in Beijing,China:"environmental inspection have caused great impact on iron ore prices，the whole supply chain has been affected by the inspections"
So the rise may still continue,and the price of semi-trailer will also be affected for a long time.