hi nice truck try adding some of this to your config will make it faster offroad
terrainCoef=.0.0;
turnCoef=2;
maxSpeed = 250;
armor=500;
canFloat=true;
attendant = true;
supplyRadius = 1.8
damperSize = 0.4; // max. damper amplitude
damperForce = 1.0; // larger number more stiffness