There is a special wrench that surrounds the outer nut and locks against the wheel which allows you to tighten the inner nut. Any NAPA store should have one. This usually breaks the bond loose between the nuts and allows the outer nut to be removed. It's much easier with a 1" drive impact wrench- - - -hand cranking big lug nuts is a PITA!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!