Redyaris is right on in my opinion. Your vehicle should be fairly light, those brakes should be good enough. I don't think any sort of proportional mass formula would be accurate considering the longer wheel base. In my experience, It takes a lot to skid the front tire, usually the rear tire comes up first. With projects like yours and mine, we have much longer wheelbases so this will be reduced.
I think there are just to many variables (cargo weight, road surface, tire condition, speed) to try a balanced breaking system. If you got it wrong it could cost you dear. If you could get an abs system to work that is a great idea and something I have not considered. I would be interested in that myself.
Obviously the simplest answer would be just have standard controls.
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