Safest & easiest way to accomplish this is to get 2 good sized pipe wrenches, place them on each rim's center hub & spin the wrenches in opposite directions. Soak them good with PB Blaster or Kroil. If they are really stubborn, you will have to heat up the hub with a torch & then repeat the wrenching in opposite directions.
Marty FORMERLY MAJORXLR8N