As mentioned above, I have found alloy wheels, with their steel centres, rusted hard on the hubs. I tried kicking them, hitting them with hammers, to no avail. Only way I could shift them was to leave the wheel nuts half a turn loose, then go for a 2 mile drive; that never failed. Steel wheels were no trouble. Once off, a good wire brushing of the hubs, and some grease, ensured I could get the wheels off next time.
Large dead blow hammer works every time.
Just don't do that on a customer's car fitted with Irmscher wheels, else you might piss them off a bit when you've mangled their chocolate wheels (or use 4x2).
With crap wheels like the Irmscher ones, such as Sportstars, or even softer, MFL MV6 wheels, terry paget's idea works best... ...though 2 miles is excessive, I do half the length of my drive, accelerating and braking briskly
. Only once have I had to do it more than once.
As Nick W says, when the wheel is off, clean up mating surfaces, and smear a bit of quality coppaslip, such as the Molyslip stuff (not the shite like carplan), and problem permenently solved