Improved Truck Physics v7.2 by Bumblebee 1.39

Use your axle softness parameters (defaulted on all trucks)
You can also do the load on the front axle yourself by finding your truck, be it a mod or a def.track. I think everyone knows where and how to look.
If a very soft cabin seems to you, then with this line cabin_suspension_travel (in the main textbook of physics) you can correct it yourself.