Greetings & Welcome!
Ohhh wow, I was just in for a big surprise, I’m in the USA, and I was under the impression that the VW Caddy’s were bigger, like our Vanagon’s used to be…
Okay, so you’ve got a mini van, they can make decent campers too. The smaller the space, the more creative you need to be to make it work and make everything fit. Even in a mini van, I would still want power, climate control, a functional kitchen, and a toilet. All of which could be used inside the van in bad weather. I would probably go with an outdoor shower though. Those pop-up shower tents are pretty awesome.
I would maybe set my kitchen up across the back, so it could be used from either inside or outside, and my toilet could be stored under the bed and slid out when needed.
You don’t need plumbing, I use dollar store plastic dish pans for sinks, and trigger spray bottles for water delivery. Cheap, simple, easy, and convenient. Saves water too.
My power system is a deep cycle battery connected with an isolator to charge it while driving. I don’t have solar, but even with the little bit of driving I do, I rarely run short on power. My house battery is in a marine style battery box, which I have attached 4 accessory outlets to each side with double faced foam tape. That gives me 8 acc. outlets which is way more than enough. Then I have adapters which you plug into an acc. outlet that converts them to USB ports as needed. I don’t use anything that requires shore power in my day to day life.
I sometimes winter in some very cold areas, so I have some big powerful heaters. What you’ll need will largely depend on your lifestyle. I live and work from inside my van, so I need to be comfortable inside at all times, not just while I’m in bed for instance. If you only need to stay warm while sleeping, good sleeping bags may be all you’ll need, or blankets & comforters. If that isn’t enough, you could add a 12v electric blanket, or a fuel powered heater. You can also use your cook stove for a backup heater too if necessary.
You’ll want a smoke detector & a carbon monoxide detector, better safe than sorry, or dead.
You don’t need anything expensive, my entire build came in at under $300 for everything, and I have more amenities than many of the people spending many thousands of dollars. Nobody needs solar panels, lithium batteries, expensive roof vents, expensive fridges, or anything expensive to live this life comfortably & reliably. I’m currently in Minneapolis, and it’s 2°f outside, but my $5 DIY heater is keeping me toasty warm, with no power required. My $20 12v fan is just as efficient as a $200+ roof vent, and I don’t need to cut a hole in my roof or worry about it leaking.
With the promoters, it’s a race to see how much of your money they can spend, but it isn’t necessary or needed. EVERYTHING necessary to live comfortably can be done very cheaply, and I’d be more than happy to contribute any tips you need. I’ve been a nomad my entire adult life by choice, and have learned a lot along the way.
Cheers!
“Everything should be made as simple as possible." ~ Einstein