I wanted more weight on front probably 5 years ago, found some suitcase weights for my Kubota on CL and was very happy, until I went to move some snow and discovered that I could not lower my FEL all the way down without hitting the weights. I almost modified the loader but decided not to. Since then, we have paved our driveway and I use a walk behind snow blower to clear it.
I don't think it would be too hard to make a custom mount for some weights, but for me, factory stuff did not play nice together.