My T4 is designed around kitesurfing and mountain biking.
Basically the cupboard at the back has all the cooking equipment in 2 metal ages on rollers.
The rest of the unit is storage and seating – the double ply on the top flips out with screw on legs to make a double bed (8×4)
It works really well for biking as there is plenty of room for a couple of bikes bungeed to the passenger side wall behind the side door.
There is loads of storage space inside the bed unit.
Laminate floor is excellent for sweeping out the mud and sand.