The form of damping: leaf spring plate
The form of traction: tripod stand traction( spring)
Tail light postpositionally
Left and right fence
Auto-circuitry of the whole trailer
The mode of air path connection: circuitry connected with spiral tube swift connector
The mode of circuitry path ;Connected with 7 core spiral cable swift connector
Surface treatment: Remove rust with large shot blast machine, remove oxidation surface , modify jointing stress , anti-rust paint, surface paint .
The process of jointing: carbon dioxide jointing press , jig jointing.
Absolutely exchangeable.