For the door open or closed question. I think if I was on the highway jacking up my car because I had a flat tire (no spare, so that would be pointless). I would leave the doors open so passing vehicles could relieve the car's stress, take the door with them and then I wouldn't have to worry about it anymore. Now would you have the top up or down on a convertible? Hmm...

Onefortypointsix, do you have any pictures???