If the hub/drum assembly is just tight on the load tube, try bolting a length of tow chain to one of the lugs, back off several feet, and snap the chain like a whip. I've pulled axles and hubs that way when I didn't have a slide hammer for the past 40 years or so.
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!