You can get Penetrene at Repco, but there are probably cheaper places.
I've only worked on wheels removed from the vehicle, and before long I took the time to make a bead breaker accessory for my hydraulic press, just because the safety rims cars use really present a problem. Once I had made the breaker, I used it for putting the second bead back on as well. I was wondering about tipping your vehicle on its side, it should make it easier. The long term solution, though, is to unfreeze those hubs so you can remove the wheels easily.
