I have only used a ROBB once and my brother in law who owns a 3000 series JD had found one and it was great. He has rocky ground and could take the rippers and pull the rocks up and then roll the box over and level the ground and rocks as needed. Must be able to reach the lever from the seat for the fullest and easiest use.
I致e got irregular sandy rocky somewhat sloped ground.
I would like the 60 but it sounds like the next size down would be a better fit. I have a loader on the front for weight but it may not help.