The name of the enterprise should be concise and the words should be good enough to express or imply the characteristics of the enterprise. "Mianyang Fuxiang Automobile Trading Co., Ltd." you mentioned is actually the name of an enterprise, so it is much easier to name it, because the name of the enterprise is based on the standards of the city, which means that it can be used in Mianyang as long as it is not the same name, but the trademark is different.
The industrial and commercial bureau is right, because Mianyang Fuxiang Automobile Co., Ltd. sounds like an automobile manufacturer, and your business scope is difficult to define. If you like the word "Fuxiang", I suggest calling it "Mianyang Fuxiang Industrial Co., Ltd." so that you can run it in the future. In addition, you can call it "Shunda", "Shunfeng" and so on. I wish you a prosperous business!