Do you have a receiver hitch on the car? If so get an outboard trolley, and mount a tube onto it so it fits in the receiver. Tilt the tube into the receiver, lift the outboard up, slide it into the receiver, and put the pin in. Well after loading the boat into the trunk. A rack mounted to the trolley somehow could also store the gas can. No smells in the car!
I have one of these, and do not use it often, but it is nice to have at certain times.