Need help getting rear drums off - puller?

[hpcgmc]

I'm trying to get the rear drums off my 67 GMC. Apparently I haven't checked the rear brake pads in 20 years or so - probably because I couldn't get the drums off! I've tried pb blaster, hitting as hard as I can with a deadblow hammer, trying to pound them off from the backside, etc. The e-brake is off, the brake adjusters are turned as far in as possible, there are no threaded holes to put in a bolt, and no clips or screws holding the hub on (all of these have been suggested in the numerous posts I've read).

Has anyone see a puller that is large enough to pull a drum brake? The biggest I found at Harbor Freight is only 10", and the hub is about 12". I checked Autozone for their tool rentals and they don't have anything big enough.

It seems like just hitting it with a hammer is not doing anything. The hubs will wiggle a little, but I can't see any movement between the hubs and the center of the axle.

Any ideas would be appreciated!