"...but the axle was also welded to the leaf springs. "
Wow, I've never seen that before.
Don't know how I missed the bearing saga til now. I have chained up, with a boomer and chain, an axle before on tandem stock trailers. It takes ALOT of boomer and a cheater pipe handle to get it up and mobile, but it's possible.
I know you'll be glad when she's sitting back at home. Good luck buddy.