Adding disc brakes to the back isn't a cost effective swap for now and unnecessary unless you are racing or just have to show off that you have rear discs. Upgrading the front brakes will make a much bigger difference as they do most of the stopping. .
agreed, the only problem with drum is if you are frequently hard on the backs like in road course or circle track the heat expands the drum which causes you to loose your pedal. Plus for racing purposes there are many different pads you can get to deal with the heat but drum shoes are what's in the box. I have the disk brakes ready to install in the rear but I haven't made the time to do it since the rear drums are excellent. There is a reason 90% of heavy truck buyers today still choose tried-and-true drum brakes, drums give you more braking power and the drum does not warp like a disk does.
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