You might want to add Opus to your short list. They make pop-up tent campers for off-road use and have a portable toilet and a shower (with hot water) in a tent. So technically not a bathroom but will allow oyu to do your bathroom duties. I’m not about to down-size to a pop-up but if I did it would be an Opus.
Edit: Here’s the link https://www.opuscamper.us/
