i used following to spawn the vehicle server side:
_vehicle = (_vehicleData select 1) createVehicle (getPos _spawnObject);
_vehicle setDir (getDir _spawnObject);
_vehicle disableTIEquipment true;
clearItemCargoGlobal _vehicle;
clearMagazineCargoGlobal _vehicle;
clearWeaponCargoGlobal _vehicle;
clearBackpackCargoGlobal _vehicle;