This is on topic because I did take an 8-day trip through NM & CO sleeping inside. I decided that this was not going to work for me because: I was on a raised platform to allow me to stretch out at 6'2"; this left too little room above me to do anything but roll over; due to the cramped conditions with the other stuff inside, it was too hard and took too long to get dressed; it was too much trouble to roll the electric windows up or down; I spent too much time making and installing bug netting and privacy blackouts in the windows; there was no way to open my rear hatch from inside; it rained in one night before I woke up to close up, and then it was steamy and hot; while I thought it would be easy to get to,the front seat and drive away from danger, it was far from it; I usually had a tarp staked out that needed taking down and the seats we're full of stuff normally stowed where I was sleeping.
I thought my only solution was a roof top tent. I didn't want to do this because: I carry stuff on top in a rack; it was relatively hard for me to climb up and down; putting it down and stowing all the needed stuff took time, while not much, enough to notice; I wasn't happy with now long it would take me to get down and in the drivers seat to run away, not to mention with a big tent set up on my roof.
My solution (so far, at least) has been an Oz Tent. I stow it outside its bag making time to get it out less. I stow it on the floor under shelves and kitchen stuff with access through the rear hatch (which, by the way, acts as a rain cover while getting it out). I stow all the tents' accessories separately keeping the weight of lifting it out to a minimum. HERE'S THE BIGGIE: from the moment the tent is clear of its stow hole till the time I'm inside with the rain door zipped is 35 secs. I just lay it on the ground, spread the sides, and lift up a front ridge pole. Inside, I click two poles together; and it's up. Now, staking it down (if there's lots of wind and staking out the front patio awning take a little more. My sleeping gear and stuff needed at night live in a duffle bag that gets thrown in very quickly.
The point is, I can be out of the weather in less time than it took me to get my insides set up to sleep. I have all the room I need to sit or stand up. If I set up on the Drivers Side, I feel, I can be in my seat, ready to escape very quickly. True, the bad guys would get my tent; but Misters Smith and Wesson may have a word or two about that.
Would another tent work as well? I doubt it. They do sell some pop up tents; it they're not very sturdy or weather proof.
Pebbledropper