I have a 5100M with the H260 and cannot seem to get enough ballast weight. If I stuff a full 84" bucket full of dirt, the loaded tires plus 2K lbs of rear ballast will not keep it as firmly planted as I would like. I think it has to do with the geometry of the loader mounts. They seem too far forward. Comparing the ratio of the distance to wheelbase, the 5100M is almost half that on my 5300, giving the loader more leverage to lift the rears. Be extra careful on even slight slopes and turning at the same time! The H260 is a beast and happy with its capacity. For rear ballast, recommend at least 2K lbs, even if you load your tires (mine are). I really wanted one of the steel 3pt ballasts you see overseas but you would not believe the price!