I’m pretty sure the hub is a taper fit on the axle shaft, and there is a puller for that.

To remove the wheel center or dish though I’d doubt it is a taper fit, remove lug nuts and it is probably just rusted snug on the hub, same as can happen on newer trucks/wheels.
With lug nuts removed a big rubber mallet or sledge hammer and block of wood might shake wheel loose, hammer on side of wheel at the edge, don’t bend the wheel.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-