As noted by others, if you swap those hubs, clean out the tubes and make sure it's coated in some way to prevent rust and seizing in the future. Even if it's clean now, the vehicle is old, and it'll be on the verge of needing some attention in that spot, as the mating surfaces have a fairly high area.
When assemblies such as those are highly resistant to conventional removal methods, there are essentially unlimited other ways to get it done quickly. Just use your brain, a bit of muscle if that's your way, and don't break a sweat. As long as you get an even pull, you'll be fine.
As with almost every other undercarriage part, soak it the night before. I generally use CLP, but you'll rarely get people to ditch their favorite penetrating lube.
Cheers,
Kennith