Can anyone remember the Mighty mo dump truck made in the 70's?

It was yellow and quite big ( for a 6 year old ) and it had a heavy friction motor, you had to push it slowly and quite hard to get it going, it made a strange sound and went along the floor for ages.

I remember having one as a kid, but after look on the net it seems to have vanished without trace.

They did small versions as well called mini mo's i think.

stuff comes up on google and on usa ebay.....

atb

steve