What is the spring like wire between the front of the trailer and the car?
The general is two lines of work, a thread is put in front of the battery wire, electric to the back of the brake lamp and the lamp, and a ventilation pressure, behind have the brakes must be back to ah, from the pressure in front of the barrel
Emergency lights and other power supply, both sides of the brake gas line and parking brake high-pressure gas pipe, three tubes are indispensable.
Three lines, the spring can reach 90 degrees when the expansion of the role of rotation, the middle one for the width of the light, brake lights, steering lights,
