Living in your vehicle is quite easy, and a humbling experience to boot!
Here are some things necessary to keep in consideration when living in your truck...
Step 1: Maslow's Hierarchy of Needs
Keep in mind that in order to survive and have a good quality of life, you'll need a structure like this. The strong base allows for a healthy state of mind and affords one the wellness needed upon which to build and continue a humble life on the road.
The pyramid is interpreted like this: to maintain quality to one's life, the bottom most layer must first be fulfilled. Only after that can the next layer really ever be finished, and so forth.
This Instructable gives an idea of how to fulfill the initial bottom layers.
A great book to have on your person is: How to Stay Alive In the Woods, by Bradford Angier.
Lots of basics of survival can be learned there, and it behooves one to always be prepared for the unexpected. I mention this book at this point because Mr Angier shows a multitude of ways to fulfill the aforementioned bottom tiers.