There is an inherent problem with two screens that you might not be aware of. Unless you spend some time with desktop config software, applications want to start on the main screen, which should probably be your front one. The problem becomes this: Let's say your passenger wants to watch a movie, so they trigger it on their screen. The player pops up on your screen (the primary) and you have to drag it to the "connected" edge so that your passenger can then drag it and maximize it to their screen.

Just a thought, based on problems I have had with my quad screen setup at home. I have found it very difficult if not impossible to get both ATI's and NVidia's desktop managing software to reliably open apps on the secondary screen.