All of you guys wielding hammers, torches and PB Blaster, have 1 thing in common, you're not in California. Unless the truck was used for boat launching in salt water, rust seizing the drun to the axle, shouldn't be the issue. Most likely the rear shoes are worn and grovved into the drum. This usually means that you need to remove the access plug in the baccking plate and back off the self adjuster.
