He has the big brake ki and walker beadlocks,t which limits him to a jeep axle unless he wants to spend a LOT more money. Meaning a rubi 44, which really has nothing over a hp30, and the stock locker is weaker then an ARB anyways.
Not to mention he can get a hp30 housing for under 200$, where as even an empty rubi 44 housing is close to 1000.