Throw together a control system for solar panels, plus the solar panels to feed the batteries for under $1k
And toss a canvas tent over it.
Looking at $7-10k total, for your entire comfy off grid tent living system. Potentially includes a decent size Yurt at that price.
Some system designs are available here: https://www.mobile-solarpower.com/ Kudos to Will Prowse for freely sharing his content.
...meanwhile, the most basic Jupe setup is $25k, not including tax: https://www.jupe.com/build
Yowza. As a formerly homeless person, I often wonder "Who has that kind of money?"