While doing some research for another site of mine, CoolRecommendations.com, I came across the greatest travel / xbox related product in the world.
It is a portable DVD with two 6.2" screens and has the ability to play a DVD while someone else can play video games using the second screen. It is called "Durabrand Portable DVD Player with Two 6.2" Screens".
Check it out the durabrand Portable DVD Players at Wal-Mart
I can already picture myself on the long trip with the family. The kids in the back watching "Finding Nemo" on one screen and me in the passenger seat up front playing "NBA Live 2005" on the Xbox with the other screen. Only flaw in this plan is I always end up doing all the driving. Wonder if I can still score 40 with Kobe while driving?
I'm pretty sure I'll buy this product over the weekend so I'll let you know how it holds up to expectations.