How to legally refit RV

First of all, we should understand the scope of legal modification in China, such as rim, color, local spraying (not more than 30%), exterior decoration (not damaging the distinctive features of the car), automobile interior decoration (seats are not allowed to be disassembled), variable gate valve exhaust pipe, anti-collision steel beam and so on. However, those who apply for industrial and commercial changes still have to apply, otherwise it will be considered as illegal modification.