I want to thank all of you for the good ideas and help.

I have some homework to do:

Pressure test
Test brakes in reverse
Check condition of backing plates (pads)
Swap backing plates and shoes to another wheel
Check spring mounts/u-bolts
Verifiy that e-brake is properly adjusted

I'll go out and try these over the next few weeks (it's busy around here) and report back.

Thank again!