Another point to watch out for if you share driving, When our car broke down and we were travelling up in scotland, the hire car was ok but as I was the named driver and my husband was the additional driver, only I was covered to drive the hire car. This was some years ago and I had no problem as used to driving but just thought it might be something to check, especially if there was a big difference in age of the drivers. It may have changed these days. Re the bumps and dents issue I choose to take photos of any hire things when I get them. You have the evidence and date to show if there is any problems.