I agree, the Rover is similar in the rounded alloy base with offset wheels but it doesn't look like a copy (or at least close to being one) like the rest of these. It would have just been influenced.
Finally I know how Whirlwind ended, they became Masport (Australia)!
Both the Gardener and the Rover are hard to move around, you get it on the wrong angle and they stop moving, wouldn't be fun going up a hill. I can see why they didn't last into the 1960s. And like you said it would be hard for height adjustment.
He got the Sabre for $50, great deal if you ask me!
Cheers Jack!
