The porta-botes are really cool, but I've never used them or heard any personal experience. A guy had one for sale here locally and i thought hard about it. Have you looked into inflatable pontoons? They'll have a nice wide base to keep it stable, and I've even seen them with a transom for mounting an outboard or trolling motor. Plus it should fold up nicely into a car. Limited room to move around, but there's not much room to move in a jon boat either. the pontoons will have a little storage, and seats, plus they look like fun. let us know what you decide on, I hope you find just what you need.