I purchased a dvd player and 2 x headrest monitors for my wife's car. It turns out the dvd player is a dud as it doesn't play some basic dvds. The dealer is probably going to offer to replace or refund the dvd player. We have a decent collection of Blu Rays and I thought about installing an entry level Blu Ray player in the car. Is this a good idea? I am concerned that dedicated car dvd players have special mechanisms to cope with bumpy roads, but a regular blu ray player does not. Thanks for your assistance.