The standard Jalo arrangement was for either one thin wheel running in the muddle of the frame, or two wheels attached each side of the frame.
I still use my Jalo for a wide range of gardening jobs.
The machine had quite a few attachments incuding rake, scarifier, lawn aeretor as well as the ridger and plough you showed in the photo. I also have a seed sowing attachment, which apparently was tried, but never fully developed - it being too expensive
The wide 'roller' type wheel I haven't seen before, and it was not in the last catalogue I saw.
The original frame was made from a cast alloy.
Dusty Rhodes