Good info. I used to have a canopy. It was something like 8' x 20'. Metal poles, canvas top, stretchy tethers to hold the canvas top in place. A bit bulky packaging those metal poles. But assembly was easy and fairly quick. Now, imagine this.
I tow around my 5'x10' utility trailer, easily carrying the canopy in all its pieces. And carry some bedding wherever. When I get ready to sleep / camp, I set up the canopy, back the trailer up under the canopy, put my Glock under my pillow, then sleep like a baby on an inflating foam mattress and comfy bedding stuff on the floor of the trailer, under the canopy. Strap the canopy to the trailer so wind / rain won't launch it. I used to do this, parking a 1988 Chevy Suburban Scottsdale with a standard mattress in the bed area of that truck. Left the windows down, rear doors open, pulled the bulbs out of the overhead lights. Had a breeze from heaven through the truck all night, it was awesome rain or dry.
It would be quite perfect on the bed of a utility trailer. The only downside is to have to be towing the trailer around all the time. But other than that, 35 mpg pulling the trailer and a really quite nice place to sleep, cheap. Could even stealth camp in many places. Fun! I'd rather not have to tow the trailer. But I would imagine it getting stuffy in the car when warm and humid. And then there's the compromising of the interior of the car (like removing the rear seat backs, or cushions, or both) to make a sleeping area.
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View my fuel log 2020 Mirage ES 1.2 manual: 42.4 mpg (US) ... 18.0 km/L ... 5.5 L/100 km ... 51.0 mpg (Imp)