I don't use mod system but I do use realistic weather. I've tested it quite a bit trying to get you some decent feedback because I love your mods and this one is no exception. It seems like around 20cm is the cutoff. I love plowing so I've set up Judith Plaines to be able to do that on roads etc. The grader is the bomb on anything below the 20cm. Once it gets any higher, the buildup in front of the blade is enough to launch her and when it's really deep like at the max 100cm, you can't move an inch without clearance from the FAA. I work with a few modding outfits and we've seen it before on dozers and buckets which is why we usually leave a way for you to deactivate the blade collisions. (fold function) I don't know if perhaps that's the answer here?
