I remember going on a bike/trike ride with my mom and the family that lived next door when I was 4... we ran out of trikes so David, my neighbour, had to ride a tractor the same as that, and screamed about how he didn't want to ride the tractor for the entire trip. And then he wet his pants.
And that, UER, is my memory from 1987 of the plastic ride-on tractor.