So I have the K1500 but rarely do I really need a lot of 4x4, I mostly DD it, a little bit of pavement, quite a bit of gravel, and some in town stuff. Are either of these worth it? I do use 4x4 when doing some jobs I've heard that a locker can make turning dangerous because they won't let any traction escape. Would a posi in back and selective locker in front be a better option?