venture rear hub abd bearing assembly

I am replacing the "hub and bearing assembly" on a 2000 venture van with drum brakes. I removed the four bolts holding it on, but I can not get the hub assebmbly to break loose on from the backing plates. Any suggestions?

thanks
mike

I replaced my right rear last year and had the same issue....a few shots of PB blaster & some well-placed hammer & chisel blows eventually worked it free....but yeah; it was a pain to break loose....