I pocketed 80k when I sold me house and thought I could live in my truck a few months to save some cash while I stacked up on overtime and travelled on my off days. Everything is a complete inconvenience. Luckily I can wash clothes and shower at my job but most people don't have that luxury. Gas is higher obviously since you're in your car more time and if you're in Texas, you're going to be running that AC all day. You're going to be eating a lot of fast food unless you get some kind of cooking setup. Also, living in a car, expenses are still going to be minimum 1k a month when you factor in food, fuel, car maintenance, gym membership etc.. And don't get in a accident because your house is gone in a flash. I did that shyt a week and then went and got me an apartment. There's no feeling more shytty than getting off a long shift at work and going "home" to a car.
If I lived somewhere close to a lot of national parks, say Colorado, I could make it work for a couple years. Part of the problem living in the car is you need a safe place to park every night and even then, every place is safe until it isn't. I was always worried someone would roll up on me at night. I spend around 30k on housing now and I think living in my truck, I could keep that cost at 12k or less. Still, it would be one hell of a mind fukk.