I imagine with a van some utilities might be a little bit of an issue. Power, water, internet, how do you even?
Short of living in a caravan park, that is, and you know what people are like with their pride. They would rather be cold and dirty than live in any sort of close community without large fences to keep everybody out.
I have no shame, but caravan parks are either expensive or illegal. I did end up spending a week at a campsite while dodging police (I had a spot I purchased for like 30 dollars a month for overnight parking, but the police would force you out despite your valid permit if they realized you were living there) but it's not really an issue. Water is in jugs, and you get it from a sink from a variety of places - library, job, gym. Gym membership certainly makes the whole exercise a lot more pleasant.
Most cars have power, though I barely ever used mine - to charge my cheapo (but long battery life and low battery use) phone and the temp battery for my flashlight, and occasionally for heat was I feeling particularly lazy. There's not really a whole lot you need power for that can't be managed off a small rechargeable battery. I liked not being exposed to time-wasting luxuries constantly, it was very relaxing, so lack of power and internet were positives in my opinion. If I wanted to go online, I'd hit the library or internet cafe like, you know, a normal person, instead of your average entitled first world upper/middle class person.
A cheapo chemical toilet install was a nice early addition, cost... 80 bucks, maybe? Plus like 5 dollars a month for the chemicals? Still, not bad.
I don't actually consider myself having been homeless during this period, to be honest. I know what it's like to be homeless, and this wasn't it - I HAD a home. It was the only place that's actually felt like home for me over the last... seven years? I lived out of that van for two years, and it had everything I could have wanted, it was cozy, it was personal, it was
mine.
I don't know why I would have been considered homeless, but someone living out of an apartment wouldn't be - I had a home all to myself,
they just have a couple rooms someone is letting them use until a better offer comes along, but which they have no control over. I certainly feel more homeless now than I did then, living out of what is honestly a nice apartment but it's not the same as having your own place.
That isn't normal though I have no idea how you'd survive in van when it's 40C outside in Texas or -40C in Alaska or something.
The heat is BY FAR the worst. The solution to cold is a good thermal sleeping bag, a reflective blanket, and then some thick blankets/rags/sheets/whatever else to pile on top of yourself. It also means you can actually buy and keep chilled food by storing it in a container under the vehicle and not worrying about it instantly going bad.
And then you praise the weather when it snows because it is amazing insulation and keeps you so warm inside. Getting snowed in was basically the best.
But heat? Bluh. There's no good way to deal with heat. It's just bad solutions and worse solutions.