“solar-powered”

https://newatlas.com/homegrown-timberline-trailer/51118/

telescoping camper

Go here

Teardrops

Here it is.

Not camping proper, but pretty close. Tudor tiny mobile home

KarTent cardboard camping

Igloo with fireplace

Lightweight, fiberglass. nest

There is a video on YouTube that shows some of the interior, but not a lot of details (and you might want to turn the volume down some):

This is maybe a bit on the glamorous side of outrageous camping, but in case interested:

Cabins with no electricity