There are adjustment screws on both sides of this board. You can find a professional auto mechanic to adjust the gap by adjusting the screws. Trailer is the main means of road transportation, and we can often see it when driving on expressway. Only the front of the trailer has electricity, but the rear has no electricity. It is recommended that all semi-trailer drivers maintain their cars on time to keep them in good condition. Don't overload or overspeed during transportation. If the vehicle is overloaded for a long time, it will increase the load of the engine and transmission system, thus reducing the service life of the engine and transmission system. Moreover, long-term overload driving will cause metal fatigue of the frame, which will break or deform in serious cases. So, be sure not to overload. Don't drive too fast during transportation. Speeding will extend the braking distance, which may lead to serious traffic accidents in an emergency. Don't drive tired during transportation. It is recommended to have a rest after four hours of continuous driving. Generally, the trailer will be equipped with two or three drivers, so that the drivers can take turns to drive and rest.