Good sealing performance. The basic requirement for installing a roof system is to ensure that no dust or leakage will occur during transportation.
Good safety performance. The closed box cover should not exceed the body too much, which will affect the normal driving and form a safety hazard. Changes to the whole vehicle should be reduced to ensure that the center of gravity of the vehicle remains unchanged when loading.
Easy to use. The top cover system can be opened and closed normally in a short time, and the cargo loading and unloading process is not affected.
Small size and light weight. Try not to occupy the inner space of the carriage, and the self-weight should not be too large, otherwise it will reduce the transportation efficiency or overload. ?
Good reliability. The service life and maintenance cost of the whole closed box cover system will affect the operating efficiency of the owner.