The main tube is a large R angle square tube trailer bracket, when the tractor and trailer are separated, it is always used to support the ground and bear the first part of the load. Heavy and light commercial.
CARAS D3S LED bulb can connect to factory ballasts directly. There is no need of cables and users do not need to take off the ballasts. The ballasts will be kept and there is no change of the circuit, therefore no CANBUS issues. It can fit all vehicles wh