You can push down with the weight of the machine for more compaction but the more you push down the less traction you have. A friend has 140M and it had adjustable down force control on the rippers so you don’t have to worry about doing it manually while grading. The gov/council guys tell me they get it put in their graders too.
If the ground is pretty smooth it’s not hard to manage manually but if it’s got too many ups and downs you can get hung up if your too slow adjusting. I usually try to spread or grade and roll at the same time but sometimes it works better with a few hard passes at the the end.
It pivots in the centre to allow for twisting. This one has 16” tyres but I got two in the auction and the other has 15”. They need sandblasting and painting and some slop taking out of the pivot but I think they are pretty good. Means you can value add to the job and don’t need more people to do it.
Broons here in Australia makes a few different types some that you can pick up with the rippers and some are just towed.
Thanks for asking I like it when things spin off too, you get to find out how other people do things. I always enjoy learning new things.