The VX was an expensive low-carrying capacity car/truck new type vehicle. Who ever heard of such a thing at the time? Especially from Isuzu, infamous for rollover tendencies. It was an experiment that succeeded in bring about the later crossover era. When you are the first one in, there is always a very high inherent risk you won't sell many, especially when redefining transportation ideas; so they tooled up for only 5000 copies to help mimimize that risk. It probably helped Isuzu shake its unsafe image and carry on for approx. 10 more years. That was the benefit of them showing the world that they could afford to experiment via the VX project.