The cost of steel and tires had been increasing up due to the Crackdown aims at pollution in recycling industry in china. It had effected the price of trailer

Crackdown aims at pollution in recycling industry

(post from china daily, http://www.chinadaily.com.cn)

China is taking steps to standardize its solid waste recycling industry, which despite being a burgeoning green sector has stoked environmental concerns due to reckless expansion.

The Ministry of Environmental Protection and other government agencies have launched a campaign targeting irregularities in the recovery of waste materials including electronics, tires, plastics, clothes and home appliances.

Until the end of the year, the government will crack down on small workshops producing heavy pollution, improve the infrastructure in industrial districts, and guide the sector's healthy development.