Try to get some Penetrating oil or Coke (drink not powder
) onto the studs where they enter the hub. I know that is difficult with the wheels on but maybe through the centre hole or from behind. Leave it to soak in for a while. Get a metal rod or bar onto the head of the wheel Stud/Bolt and strike it firmly a few times with a large mallet in the direction of the hub. Be carefull not to damage the wheel (or your fingers
).
Use a long socket bar with a pipe extension to torque the Bolt out.
Good luck