I tow with them up (that's closed, as must of them need pulling up to block out the light as opposed to the normal down to close), the reason being, if we need to stop en-route I don't need to get in the van to close them each time to keep out prying eyes. So for security, we close them. I am also thinking about getting a blind for the rear of the car when travelling with our dog. Not to keep him cool or to stop him barking but for the benefit of those that are following behind. We have a male Ridgeback with one of the biggest set or cream crackers I ever saw, he also sleeps standing up in the car with his head on the back seat and his rear in the back window. Although it saves me having to buy a novelty "Nodding Dog", it can't be too pleasant a view for other motorists.........