Well, here's my take on the question and why I tow a PUP.
I had a medium size camper that I towed behind a motorcycle
and then I bought an HHR to tow it with, but there were
limitations on the HHR. Namely a 1000 lb limit. So I sold
the HHR and bought a GMC Terrain with 3500 lbs. of towing.
Then I sold the M/C camper and went looking. Since I live in the southwest I thought that I should be able to find a good used
one for a reasonable amount. It turns out that most of the hardsided
campers weigh more than the towing capacity of my new GMC.
There are a few exceptions but that's another subject.
I wound up with a Palomino Y 4124 that has a 12' box and expands
to 24'. Just about right for the two of us (the wife)
The beauty of this setup is that even with the trailer
(and I keep my foot out of the gas pedal, I get 21/22 mpg most
of the time.)
Frank