Important to think through how you will actually use the boat when camping. An inflatable takes time to inflate and deflate and assemble with its seats, etc. and the same is true with a Porta-bote.
For rowing the Porta-bote is far superior to an inflatable. One propulsion option is a small trolling motor and a small car battery.
Either in your size range will weigh around 100 lbs. or more and will not be easy to lift or store while traveling with an RV.
Easiest way to go is to have a toad or a tow vehicle with a roof rack and use canoes or kayaks. It would also be practical to mount an aluminum dingy upside down on a roof rack for transport.