I'd be interested in similar information, seeing as how we just bought a "pop up" outhouse / shower, we are going to need something to go out to...
Basically looking for a porta potti primer.
What is the difference between the brands and models.
Any features to look for, anything to avoid.
Any easier to maintain? Empty? Fill (with water for flushing folks)
Air pump vs flush ???
One item, I've been cognizant of is the height. I want to travel with it in the back of the P/U under my tonneau. Seems that some models have the same top half with a smaller or larger bottom.
For us, primary intended use would be for night time liquids except in emergency or the very very rare boondocking