Ariel gets a lot of wildlife really close to her tiny house. She uses a Nature’s Head composting toilet, does have a shower as well, but uses the shower at the gym in real life. Her tiny house is a lot higher than a van and can have all sorts of feeds run into it and outputs out of it, but it’s great for inspiration.
She has a neat solar power setup at a small distance, in addition to a generator, and I noticed that she uses a Renogy inverter and charge controller, so she likely also uses Renogy solar panels. I looked into it and they’re available in the UK, not only via Amazon, but also via Renogy UK and last time I looked, Renogy was offering 10% off on your first order.
Ariel also mentions a catalytic propane heater that does a good job but does sometimes smell up the place a little bit, so that may be a tip for what not to use.