Max has no rear trailer hook, only front trailer hook. Definition of trailer: trailer hook, also known as trailer ball, is a traction device connected to the rear anti-collision beam of the vehicle. Mainly installed in ordinary family cars, towing trailers and trailers under 1700kg. Of course, it can also be used to hold some rear suitcases or bicycle racks. Relevant regulations on trailer hitch installation: According to the Regulations on Motor Vehicle Registration issued by the Ministry of Public Security, front and rear anti-collision devices are allowed to be installed on small and minibuses, so it is legal to install trailer hitch as long as it meets the requirements. However, it is not allowed to install trailer hooks protruding from the car body, because it is illegal to modify the structure, structure and characteristics of motor vehicles without authorization as stipulated in the first paragraph of Article 16 of the Road Traffic Safety Law.