Could Zeroids Do Any Real Work?

I wonder just how much weight could a Zeroid have pulled?

I remember the brown one distinctly dragging his box trailer along behind him. He gave my Action Man a ride round the room now and then.

But could Zeroid's do any real work?

Would that trailer take a a book from one side of the room to another for instance or maybe relocate a whole stack of loose SpaceX vehicles?

There's one other working Robot I'd have loved as a nipper in 1968, Captain Robo from Yonezawa - their 21st Century Space Series range. It looks superb but I don't know how the robot pulled the trailer. Or did it?

Captain Robo reminds me of something in Space Safari by Miniflex. I haven't got that set so if you have maybe let me know which vehicle I'm thinking of. 

The Captain's red domed cockpit has a look of the Project SWORD Moon Ranger too. I'd like to get a good clear look inside that red dome.

Did you have any working robots as a kid? Zeroids, Ding a Lings etc?