Seriously dumb question about frozen/rusted brakes

I run some seriously rough roads, those backing plates break around the bolt holes, so I have to replace them sometimes. lol I have started welding fender washers where they come together on the split side to keep the vibration down some, seems like they last a lot longer with that little mod.

 

There are so many things that don't add up here. If the slack adjuster moves freely so does the cam and it's not cammed over nor are the bushings rusted or stuck.

Then with Full lockers you managed to move the truck a few feet but the brakes on one axle are still stuck? All four wheel ends had to have turned with full lockers,

 

Not if the interlock is not in too. Or could be a problem with the locker or a busted axle. Hope not.

 

That's not possible if everything is working properly. Inter axle and both lockers equals all rear wheels turning

 

Eaton or rockwells. rockwells are positive locking, eatons have a clutch in the lockers. It would be possible, but more probable that that axle is not locking for some reason.

 

I'm pretty new and might not understand what you've done so far, but have you backed the adjuster off a good bit yet? I've done that to free frozen shoes, back off until they ping. Also something like brake cleaner sprayed in there might help with chemical bonds without being a lubricant. Also acetone.