PHYSICS REWORK V4A MOD
Changes:
* Trailer damping was increased from 0.5 to 0.7
* Inertia scaling const was decreased from 1.4 to 1.0
* New recomendations for v4a:
residual_travel[]: 0.10 # for front axles
residual_travel[]: 0.088 # for other axles
g_suspension_stiffness 0.7
g_trailer_stability 0.4
g_truck_stability 0.5
