I am currently working straight commission in an industry I retired early from. This position allows me to work from home with no management oversight and a 10% commission. I realized I should not have returned to an industry I had become burned out with. I just don't have the fire in me to drum up sales like I used to. Don't get me wrong, I'm in a great business with a well established company.
Selling is just not for me any longer.
Friends of my daughters make decent money selling cars but never have good things to say about their daily routine. If you are passionate about selling cars, I would definitely make sure I was selling vehicles that were appealing to me. For example, I think Toyota trucks are the best ones on the planet. I've owned many makes, but always had the best experience with Toyota. I could talk someone's ear off about the positive benefits of owning one. But, I couldn't stand the weekend work that's required in selling automobiles.
Good luck.