I am mostly car-free. Occasionally I rent a car when I want to travel a significant distance for a few days, but I have never been able to bring my bicycle. In the future I plan to buy a folding bike, but for now I'm trying to figure out how to take a full-sized bike on my trips with a rental car. Renting an SUV or van is out of the question (cost, fuel economy etc). I'm looking for recommendations for a bike rack that easily and temporarily attaches to a compact-sized car without leaving any marks or damage when removed. I'm also looking for ideas on securing the bicycle (from theft) to the vehicle on the rack when I am away from my car. Removing my bicycle from the rack/car every time I'm away from the car to run an errand is not practical.
Please share your ideas