where you might want to make multiple adjustments on the fly.
One possible reason to not have the hydraulic adjustment is that if you wanted to turn the rake 180 degrees and use it in reverse, you would first have to detach the cylinder. Any thoughts?
Second question:
I am planning to get a Rankin chain harrow. It is a 5/8' by 3" dual sided chain harrow. I have been doing some additional research on chain harrows, and there seem to be quite a few variations on the theme. Some are not dual sided, so when you flip them over they simply smooth whatever they are being dragged over. And, there are other differences, diameter of chain, type of steel, and design and length of tine.
It is possible to get a simple bar mounted drag harrow, or you can get one that has a 3pt frame, so that you can lift the harrow up into the air for transport or for backing up to a fence. This would be nice because it would allow you to start to drag right from the fence-line.