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Good tech. This is the same calculation I use. I always go .9-1.0 for the COF as even in mud the worst case is when you catch something solid like a root. Which brings us to the topic of shock loads... I feel a safety factor of 2-3 is about right. I also feel that worst case is about half the vehicle's weight is on one rear tire (beyond that I am easy on the throttle to prevent a roll).

Bottom line is, I divide the total weight by two to get the max load, then multiply by two to cover shock loads, and end up in the same place you do.
 
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