Are after-market self-adjusters available for 1954 1/2 ton truck brakes?

John,

If worse comes to worse, maybe people will post techniques for pulling off the stuck drums by various brute-force methods. I hesitate to say that I have done this with a perversely rigged come-along.

The adjusters might be stuck (Wrenchbender's advice might help) and/or the drums might be "rust welded" to the rear axles. Any mounting hardware that might break due to brute-force removal is easy to replace (and, you might plan/want to replace the mounting hardware anyway).