How to Live in Your Car at WikiHow deals with the gritty possible of long-term camping.

Living in a car isn't something that anyone would recommend. However, when you get laid off, your emergency fund runs out, your home is foreclosed (or you get an eviction notice) and there's nobody to help, living in your car might be the only choice, especially if you don't feel safe at a local shelter. Unfortunately, in many places, sleeping in your car is not only frowned upon, but also illegal. Here's how to get by until something better comes along.

Remember, you are not alone and you have a vehicle.

Subsequent advice is Mother Courage stuff. For instance, use a car cover (to hide your presence) and move slowly so the car won't rock.

Grit your teeth and read it -- even as we hope we never have to use it, this info is good to know.