The brief for this camper was to enable a completely off-grid outdoors lifestyle for half of the year, to enable our customers to go mountain climbing in Europe.  This meant they needed room for storage of 2 large rucksacks!
The specification:
Water filtration system using UV lamps to enable water purification from natural streams.
Stow away shower kit (Included in the pictures).
300W solar panel charging a 280AH AGM battery.
Toilet in an under counter drawer.
Underslung large LPG tank which runs the air and water heater and oven.
Top loading fridge fitted under the worktop.
Double bed/living room.