If you are going to spend the money and drive on snow and ice, skip the the detroit idea, use an Ox or ARB if you can afford it, you will be much happier, for the axle shafts get chromos if you can afford it. That way no need for anything else fancy and will definitely hold up to your wheeling and make you a very happy man.
Stock axle shafts don't flex much and tend to shatter, whereas a good chromo shaft twists and then returns to it's original shape. As for the detroits even though they are an excellent locker, it's street manners even though acceptable to some, aren't really all that great. My yellow Jeep has ARB's and the other one I acquired has detroits, now if you like your Jeep to lift the left rear corner and barking tires and other funny stuff when you drive on wet pavement or snow and ice go detroit, if you like it to behave the way it did when it was stock buy an ARB or an OX locker. With those 2 mods you wheel happily and don't need anything else, save maybe for a truss for the rear axle so you will not bend the tubes