From my point of view, if a tradesman turns up in a car not a van I instantly think DIY wannabe. But if that car was professionally wrapped, not sign written I might think yeah there professional with a fleet of vehicles, but no matter what if you use a car it's going to become dirty and not nice to use as a personal vehicle after a while. Where as a van with extra seats and then a bulkhead behind the extra seats will stay cleaner look more professional and be a lot safer and secure. Also to use the car you would have to take all the tools/materials out every time you used it for personal use and I wouldn't want to leave my Stanley knife in the bag by accident with kids in the back if that's what your thinking