There are quality inflatable boats out there, with or without sectional wood or metal floors. Probably a better "boat" than a porta bote.
Many years ago when I towed a travel trailer I had an 11'6" hard bottom (fiberglass) inflatable with a 30HP outboard. Both fit in my TV van.
When I switched to a motor home, I bough a trailer for the inflatable, but after a short time with that set up, I decided if I was going to tow a boat, I might as well tow a "real" boat and bought an 18' center console.
2014 Itasca Spirit 31K