I may have been too forward in my "disc brakes suck" comment, but here is why I feel that way.
I used to wheel a M715- non selfadjusting drums all 4 corners. PERFECT shoes,pads, wheel cylinders. 1 hour in the mud,slop, ooze, and those brakes were only trying to press the slime into submission.(no braking action) It is the design, not the condition of the components.
On my (current) mog axled rig I did front discs and the stock drums on the back at 1st. It seemed to brake pretty good (IMO)UNTIL I went to kentucky, and there are REAL hills and mountains there, unlike flat assed Indiana. I honestly had no usable brakes, and it was scary and unnerving at the same time.
I am just trying to put some info out there that perfect condition drums still fall short of the clamping action that a disc caliper will afford you. The"Squeegee" cleaning action is another plus. The pics are on my website of how to do it yourself if you want to.