We use a 10 pound sledge in our shop for this problem. Give it a good whack, then rotate the wheel 90 degrees and repeat until the wheel comes off. Leave 1 nut on loosely sp the wheel doesn't fall completely off for safety. Don't be shy about hitting it either, like I tell the young guys I work with-"Hit it like your'e gonna kill it". When you put the wheels back on, put a light coat of anti-seize compound-Permatex is good-on the hub and centering flats. That will help keep them from seizing on. Make sure that you have the truck supported on proper capacity stands when you do this, get the 5-ton or better stands. Well worth the cost.
