A toilet and shower would be very nice to have but unless you've got an extremely large sleeper you will have no storage space. The 96" units with them have about as much storage as the unoccupied half of a day cab.
the previous truck had a dinette. the owner added a 4" soft mattress that i bagged and put in the bog. the use of the dinette was great when sitting and sleeping on the provided cushions was SO MUCH better than that softie my back improved.