Michael, the car dealer is no longer there (at the port underpass). There are a couple of used car dealers in Pueblo Nuevo - one just up from Barclays bank on the service road (adjacent to the A7 heading towards Gibraltar) and the other directly opposite on the other side of the A7, next to Mercadona. Also, there are quite a few in Estepona poligono. Not sure of any nearer to Duquesa - save for maybe Brunos (?).