Will you be using traditional campgrounds or RV Parks?
If RV parks, then the outdoor kitchen may be nice as you will have a "patio area" to use it.
If traditional campgrounds, then it can be less useful. In my area, the campgrounds are set up in such a way that there isn't really room to use the outdoor kitchen comfortably. The pads are usually one vehicle width and there are rocks, trees, wooden posts, etc. along the edges. So you can't put a table alongside your RV and you have to maneuver around obstacles while you cook. So for that, I find a table and portable grill to be more convenient.
With kids, you may find the outside fridge useful as they can grab snacks and drinks without getting in your way while cooking inside.
