Use your parameters for the soft axis (default on all trucks) You can also load the front axle yourself by finding your truck If you think the cabin is very soft, then you can correct it yourself with the line cabin_suspension_travel (in the main physics text). Minor edits with the cab Example: uset g_suspension_stiffness "0.43" uset g_trailer_stability "0.3" uset g_truck_stability "0.42" Test on v1.38