Well, here's my thoughts and experiences.
RV's are prohibitively expensive and then you have to insure a vehicle engine maintenance etc.
Travel trailers and 5th wheels are the best if you want a house on wheels.
Popups blow, they're just basically a tow-able tent.
Truck campers are useful but cramped and limit your ability to use the truck.
Car living is probably the most readily available and isn't all that bad if you've got some camping gear. I did this in the worst winter possible while holding a full time job. A suburban is incredibly roomy and not very expensive. You can also park many places in the city and sleep without too much difficulty. Out of the way spots in an apartment complex that doesn't have reserve parking were my favorite. There's books and websites dedicated to the subject.
Staying in a shed is also very do able, you can insulate it and even have a stove.
Really if you have a car you can make due without too much problems in tough times.
Army tents are just expensive, heavy and hardly mobile. Haven't used one since I was a kid.
Once again, based on my experience. Since I've never lived in a Tee Pee or yurt I can't say for a fact.