1. Look at the tires

　　Visually check the tire pressure to see if there is any lack of air or debris adhering, and then check for deformation, cracks, and other phenomena on the steel rim.

　　2. Check the tightness of the semi-trailer tire screws

　　Tighten the screws of the wind cannon. Don't be too troublesome about this detail. You should check each screw one by one to see if it is tight. Running a screw halfway is a small matter, and losing a tire can also be solved with money. However, if an accident occurs, it will be regrettable. To put it simply, "Tires are nothing small." Please remember.

　　3. Just take a look at the suspension system

　　Check the tightness of all nuts, bolts, and U-bolts, as this is related to whether the tire is being worn.

　　4. Shake the legs to ensure normal operation

　　The inspection of the supporting legs must be done by shaking and dropping them a few times, and then checking for any cracks in the welding area, especially for those who are currently running, swinging, and hanging. It is important to pay attention to this issue.

　　5. Touching the wear and tear of moving parts

　　Check the box board, lock rod, reach out and touch the box board hinges, hooks, stakes, container locks and other small components to see if there are any cracks or breakage.

　　6. Check all lighting fixtures and reverse cursor pasting

　　Check the electrical circuit and feel for any abnormalities. When getting on the car, turn on the lights to see if there are any broken lights and if the reflective signs are missing. It is believed that some cardholders have been fined for missing reflective signs on the road.

　　7. Check the braking connections of the tractor and semi-trailer

　　On the dashboard in the driver's cab, check if the air pressure gauge is sufficient after starting the car, and then apply the brake pedal to test the brakes.

　　8. Listen for any air leaks in the brakes

　　Get off the car and listen for any sound of air leakage, test if the brakes are working properly.