To be clear: I may be wrong about your year, but the on most/all duallys, the hub is "full floating" and the drum wont come off until you remove the axle and bearing retainer nuts.
for a serious case, Jungerfrosch has a good way to go. You will still need to remove axle and bearings.
Agreed too- the adjusters are not strong and should not be forced. If the slave cylinder caps are frozen then the adjusters wont move them.
