OK, so far my car/camper conversion includes:
Removing passenger seat/rear fold-down seats for room.

Using Velcro to attach a blackout curtain for privacy and darkness on those nights spent in a parking lot.

Possibly buying a deep-cycle battery to run laptop, electronics, heater/fan while car isn’t running.

Cooler for beverages.

Laptop+wi-fi hotspots for Internet and entertainment.

Can opener and Titanium Spork.

Futon matress, pillow, sleeping bag for comfortable living.

Using truck stops, fitness clubs, college dorms to shower.

bike rack for bike, my alt source of transportation.

Power invertor, electric pot for food.

What are some other things I can do for my car, or to support myself for an extended vacation?