The experiment failed, "Nothing ventured, nothing learned". Some may be missing the whole point of camper shell camping and that is Simplicity. I have owned all kinds of RV's including motorhomes and trailers. I still have a thirty foot travel trailer.
The shell is my "Mini Mini Motorhome". Something I use for quick trips in mild weather. I don't want two or three batteries. I don't want a generator. It has a bed, a porta potti, and a cooler. Lots of fun, as long as I keep it simple. 23 mpg isn't bad either.