A friend of mine has a mooring in Newport Beach Ca. There's a small public dock but no where to leave anything. He has a Toyota pickup and throws an old, small inflatable in the back ( I think it's an old Avon. The one that had the attachable motor mount ) and carries it to the dock from the car when he arrives. It's a bit big but then it could be used as a second boat if needed. Or, when you arrive with more than just yourself.

You could probably find one for next to nothing.