We've got your back. With the Tough-O-Meter, you'll know whether to bring extra layers or Swiss army knives as you summit the literary mountain. (10 = Toughest)
(3) Base Camp
The Sunset Limited is a pretty easy read. Even when a character throws out some intellectual dialogue, or says something like "the dialectic of the homily presupposes a ground of evil" (to use the densest quote from the play as an example), it typically gets explained in much simpler terms shortly thereafter. So the actual style of the book is simple—and it's short.
However, you can think about the philosophical issues underlying the story over and over again, and can spend a lot of time interpreting different images and metaphors if you want to, which elevates this story above sea-level.