*trade*marks are designed to prevent Joe Schmoe from making and selling cars (the trade) and putting Ford's badge (the mark) on them. When said cars kersplodey, killing all occupants, this makes *Ford* look bad.
If you are not in the motor trade, you may call your products "Ford" anything, and use a horse badge to advertise them. You may even have a brand of cornflakes called Ford Mustangs and trademark law can do nothing about it - not in the same trade, y'see? This is why a company selling tiny devices made out of marshmellow for looking through walls can safely call them Microsoft Windows.
Note I am not addressing copyright law here since that is an entirely different beastie.