Speaking of improvised shelters....
I'm not really the outdoorsy type and figure roughing it is when the Winnebago's A/C fuel supply drops to 3 days.
I spent several years in the Army Guard and always dreaded the summer encampments. I didn't mind the work, just the sleeping arrangements.
We always went to the same places and there was always the possibility of pitching your tent/shelter-half near/on an abandoned latrine. Bummer.
Add to that, lumpy ground or hard cots, rain soaked ground, snakes and crawly insects, and I never could get a decent nights sleep. The week became one to endure, not to enjoy.
I'm a little slow, but finally hit upon the ideal solution for me to begin enjoying the encampments. What? I noticed that we always used several 1 1/2 ton cargo trailers (M-105) to carry extra gear to and from the encampments. But during the encampment, the trailers were unused... and empty.
These trailers had an interior cargo space of maybe 9x6x5 feet, had bow tops, and were canvas covered. A backpacker's nylon-mesh string hammock was a perfect fit when tied between the bows.
So, a string hammock and blanket were all I needed and I began to enjoy camping out in my high-and-dry, snake-free, government-furnish, "tent" trailer.
The trailers were left parked near the kitchen area so early morning KP noises became my alarm clock.
After I awoke from my good nights sleep, I took down my hammock and stored it in my duffel bag, which was left safe and dry in the trailer.
You don't need to build a snow cave, lean-to, or pitch a shelter-half when you observe the natural terrain and use the improvised shelter of an existing tent trailer, which always seemed to be following me.
Back in the day when I camped regularly, my preferred "tent" weighted 2000 pounds, empty. You may prefer a smaller personal tent. To each his own.