I used to keep a double duvet and pillows in the wardrobe but I've found it's easier to keep it on the rear shelf - I fold it in 3 lengthways the roll it up and put a bungee round it. Two pillows also live there, with another two as back cushions on the rear seat. I have a holdall I keep in the house, when I come back from a trip I wash anything that needs washing and replace towels etc and any used toiletries, then all I have to do when going away is throw in the clothes I may need for the trip and put it on the rear shelf.. I live in jeans and T shirts so it's not difficult.
The wardrobe now contains waterproofs for me and for my scooter, spare jumpers, hats (woolly and sun), rucksack etc etc including that bottle of wine of course with glasses in a padded box! And spare space for anything I want to chuck in there, camera etc.
Cupboards under sink - right hand one, tea, coffee, sauces, food sachets, etc. Space for bread, biscuits, eggs and other perishables. Left hand one holds plates, cups, pans, washing up stuff and first aid.
Under bed drawer has tins and cartons of food and milk with long keeping dates one side, and silver interior thermal blinds for front windows other side. Oh and the pegs and tiedown guys for the windout awning.
Rear cupboards have beach towels (double as shower towels), sleeping bag for extra warmth or extra camper, useful stuff like spare bungees for this and that, and a very useful device for starting the engine if the battery is flat (note to self, must charge that up!). Under the shelf I keep my folding mobility scooter and a box with wellies, spare trainers etc, and the long space where others might keep skis etc holds a flagpole and a camping chair - a more comfortable one than the VW ones, and easier to carry.
Admittedly it's mostly just me in the van but when Mike does come along it only means another bag with clothes, some more shoes, and another coat to chuck in the wardrobe.