SlingBox is okay but if you already have a laptop, and if you don't, you should considering it is a 100% TAX write off, then I suggest leaving your TV at home.
Most everyone I talk to always says they don't have enough storage space as it is. Throw the TV out the window and take a look into this. It's the best investment I have ever made for my truck, and I am writing it off on my taxes as well because it has news and weather for routing purposes.
Its Satellite TV for your PC with 4000 channels. And no, its not a membership or subsciption service that you have to pay monthly fees. I paid $99.95 for the software, downloaded it, installed it and started watching TV just like that.
I got News, Weather, Movies, Radio Stations, Educational stuff, Shopping, Kids programming, Sports ( I never miss a football game anymore because I'm not at home or the dang truckstops won't turn it on )
Anyhow, heres a link to the site.
Http://www.SatelliteTVOnMyPC.com
Oh yeah, almost forgot, I also got one of those $59.00 home theater systems from walmart on my truck with 2 tiny speakers and I put the subwoofer under my bunk. Hooked it up to my computer and it makes the movies sound awesome and the radio stations Rock!