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Wouldn't just that 25k be the answer, then? You could add the weight of the plate, but the weight of the axles themselves wouldn't be added. So 25k, plus the weight of the plate (2k?), minus the weight of everything else on an M1083 cargo (e.g. bed, different bumper, etc.).
Then that's not really a change, right? It's a 10k capacity truck, then you take the 3k bed off now giving you a 13k capacity truck, and stick a 15k howitzer on... you're only 2k over capacity for the M1083 cargo variant. You'd have to figure out which FMTV variant weighs the most in operation...
Those are all things, yes, but ONE of them is the limiting factor. I think that previous discussion decided that the axles had the lowest capacity.
I don't remember exactly what to search for, but I think the discussion started with someone asking if FMTVs had separated on road and off road...