While I am not exactly sure of that tractor and your setup with 4WD/weight/tires,etc, I had an M8950 (86 hp 4WD, no added weight, no cab) and pulled 5 bottoms in sandy-stony-silt-loam@ 5-6 inches with no problems.
When I was curious, I looked up the pulling data on the Nebraska Tractor Tests website and compared what I had to other tractors I was familiar with in terms of pulling power. I have done this with many models over the years and it is extremely helpful.
That tractor is a little light but I'll bet--if 4WD-- it wll pull 4 bottoms without much effort in almost any condition. The cab helps and cast centers or weights would give added assurance. Kubotas seem to "pull well" and handle plows better than you would think. If 2WD add weight to the front as well.
I think you will be fine. Good luck.