The full wall wardrobe not only gives you more storage, but it also insulates that wall better than having a window. I would have preferred if they had put that wardrobe street side so it would block traffic noise if we visit someone and park at the curb. Instead of swing doors, sliding doors would be better on the wardrobe to open it up more. We used smaller hangers inside the wardrobe - Some people build out shelves and others rotate the hanging bar 90 degrees to allow full sized hangers to fit better.
I am also surprised you need such a long extension on the SuperHitch. My 811 on a short bed used the shortest extension which gives me the most trailer towing ability short of going directly off the receiver.