bortulga
Food costs for me increased, due to less cooking. If you're in an urban area, finding a place to use a portable stove or fire is very difficult.
If you're outside of an urban area, gas/breakdowns are a constant concern.
Parking can be precarious, depending on where you are. Heat can be a problem depending on where you are. It's much easier to heat passively with blankets in the cold than to cool yourself when it's too hot to sleep.
Other notes:
- Vans are often very poorly insulated, both from sound and weather. - The social impact can be crushing.
All in all embracing a mobile hermit lifestyle with the added burden of a giant lumbering structure can be daunting. I think in general ultralite camping is a better option. More flexibility where you stay, and the benefits of having a mobile power source are overstated. Portable gas canisters/solar cells have a better value for the few times when you need mobile electricity.