@climax, copyrights extends far beyond the boundaries of physical item. Or do you think that books, movies, music and so on can't be copyrighted and you're free to do with them what you want?
"Along with that, I am selling something that I personally created, a 3D model which I made." - you may have ownership and authorship of that particular 3d model, but that doesn't mean that you will be able to copyright it. If you made a copy of ford mustang, that means you already violated the law, because ford owns all rights to its design and you are NOT allowed to copy it without permission.
"Ford doesn't make 3D models at all so there's that too." - you don't want to say that if ford would decide to make and sell 3d models of its cars, they would have to ask your permission to do so, just because you have already created such model, don't you? :]
"Only place I see with this Ford issue is at Turbo Squid and now here on CGTrader, all that makes me want to do is sell them somewhere else." - AFAIK ford made exclusive agreement with turbosquid and that means that if you want to sell ford branded 3d models, the only place where you can do that legally is turbosquid. Not cgtrader and not your own website.
"What is more hilarious is how you just remove the logos of anything and all of a sudden it is fine to do whatever with it. Take video games like Burn Out which have practically exact replicas of cars, but give them their own logos or totally removes the logos..." - no, that's not fine. Copyright goes far beyond logos. If you want to sell your model legally you have to change it beyond recognition (within reasonable limits). Cars in games like burnouts or gta only resembles real forld branded vehicles, but are distinctive enough to not get its owners in trouble. If you think that you can remove logos from your mustang, rename it to fork mustache and feel perfectly safe, then you have to think again.