Just do a search for “fulltiming”. Thats what i’m doing this year, selling my flat and living fulltime in a motorhome… 😀
If, when you hire the van, you get temporary membership of a club. You will be able to get on a site for a few hours to empty your waste water and refill your tanks. You can also charge batteries. They normally charge you about £3 for this. If there are 2 of you your water and batteries will normally last 4 to 5 days.