We don't have one, but kinda wanted one. We kind of improvised and created one.
We have a large storage compartment under a bunk in the rear, and it has a light in it. We use it as a Buffett type area. We found a folding table at SAMs Club called a tailgater table that was only $40, and has a metal foldout to hold the Weber baby Q, and we put a 2 burner camp stove on the table. It also has hooks to hang the grill tools, and a roll of paper towels.
I've looked at some mini fridges that will fit in the storage compartment, I just have to run power and buy the fridge.
After getting this set up, I think it really suits me better than the built in ones.