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I had to deal with a non-rolling GMC once. The wheel cylinders leak fluid out and cause the shoes to stick to the drums. If backing off the adjusters, banging on the backing plates etc does not free them, what I did in the field was to burn off the bolt heads that attach the backing plates to...
These trucks are always low miles so unless the shoes are oil or brake fluid soaked, all you will need to inspect/replace/rebuild are the other items. Those parts can be obtained new if they are rusted.