Guide arms used for air suspension.

As air suspension lightweight, without noise, 2-3 times life-time than leaf spring.

However, when an air spring is used, a rod system that can transmit various forces and moments other than the vertical force must be provided, so the suspension structure is complicated; in addition, the air spring has strict requirements for sealing, and its cost is also high. At present, most domestic trailers use air suspension in high-end fields such as precision instrument transportation, tobacco transportation, and hazardous chemical transportation.