That link that Sam posted. That's exactly what you want. If you want comfort, you should add tent to all the windows. I've had to sleep in a truck before. I don't know where you live but it get's really hot in those. Adding a ceiling vent fan would be mighty wise of you. Something I've always noticed. A lot of comfy blankets that makes a nest in the sleeping area. That comes in hand not only for warmth in the winter but also for a sense of being at home. Other than the places that are shown to store stuff, where will you put the other stuff? Also, rather important. Is this just for you or is someone else coming?