One thing you have to look out for are the laws in each state or certain cities like Houston or Dallas, because in some areas, sleeping in your vehicle is actually ILLEGAL.
We've all seen drones flying around in Texas haven't we? But what if you think the drone is trying to spy on you? Can you take it down with no problem?
If you go through any state's law book, you're going to find some very strange laws that are just plain weird but still enforceable no matter how ridiculous.