That can be fairly common with any vehicle at times. Even a light surface coating of rust and/or road grime on the hub and/or wheel can cause the situation you're dealing with.

To get more leverage, rather than pounding on the wheel itself, you can also just give the top, bottom, or sides of the tire that's on the rim a few good kicks from either the outside or the inside (just make sure the VX is stable and solid on the jack stands or whatever you're using), and that might be enough to at least break the bond that's currently holding everything together. The farther out from center you get when hitting the wheel/tire combo, the more force will be applied to the center area that's binding.

Once you get everything apart, a light coating of anti-seize, oil, or grease should help prevent the same thing from happening in the future...hopefully.