What is the name of those toy trucks that could pick up and move little plastic balls?

Like ten years ago, they were a big thing. There were various remote controlled trucks that you could drive around and pick up little blue and red plastic balls with. You could then load them into some sort of plastic structure or something. They used to have a display set up in lots of toy shops. Does anyone know what I am talking about?|||Rockenbock- my family has it and it is awesome! We used to play with it all day long!