If you have a few slots open on your computer, you can put in a vid-in card. That will allow you to display PS2 composite out on the computer screen. Pretty easy to do that.
As for bumps, it depends on how you mount your HDD. I use laptop drives. They are slower than full size counter parts but they can withstand shock better. As for CD, and bumps, I have no idea. I guess it will skip. But chances are you should not be and will not be playing your ps2 while driving. Even if your buddy is playing, your eyes will wonder there often.