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"ground pressure is function of weight divided by on the gorund track length and width"
I mentioned "MMP" for a purpose. Mean maximum pressure is a much better, widely accepted indicator for the ability to negotiate soft terrain. It does not like nominal ground pressure depend on track area and weight only, but on the mean maximum pressure peaks below the wheels. The quantity of wheels is important.
And btw, the Russian tanks have significantly lower nominal ground pressure as well. They CAN negotiate softer ground and that's what I mentioned.
Weight limits of bridges are also no the same as military bridging classes like MLC70. Many bridges in difficult terrain (like mountains) cannot support heavy tanks - and cannot easily be replaced/upgraded by engineers.
One tank design parameter of the 30's was that many European bridges weren't able to carry heavier than 26 ton tanks. Tanks became heavier in WW2, and many bridges weren't up to the pressure.
The difference between a 40 and a 65 ton tank's road mobility is significant in many countries.
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