Trademark and copyright are two completely different things.
Copyright applies to authorship … so VW have copyright on their vehicles insofar as other companies cannot recreate them in terms of physical design.
Drawing (or sewing) a picture of a camper van does not physically recreate a camper van so is not a copyright violation. If you put a VW logo on that camper van then you are violating trademark law as VW owns the trademark on their logo and it cannot be used without their explicit permission. If you use the term Volkswagen in your sales pitch for that item then that is also trademark violation because it is a made up name and also owned by Volkswagen.
I believe VW have attempted to also trademark the shape of their more commonly known vehicles (the camper van and beetle in particular) by claiming that they are devices or symbols that are clearly known as being related to their brand … however, I’m pretty sure this hasn’t been granted or, at least, if it has then VW haven’t been able to prove it’s validity in court. When it comes to trademarking images of tangible items it’s a pretty grey area of the law and just because a large company, or a large company’s lawyer, says ‘don’t do this thing’ that doesn’t automatically make it illegal.
If every company was able to trademark images of their products then it would mean no one could sell a photo, a film, a drawing or anything that includes any visual reproductions of items obviously (or perhaps even not so obviously) made by certain companies without explicit permission of those companies … and that way lies madness.
The camper van thing is a completely different kettle of fish to using characters from Disney etc. As characters are art and not tangible objects then the copyright applies to the authorship of that character which means they cannot be reproduced in any form (redrawn etc) without being licensed by the owners of that copyright.