Yeah your gas may be more like $600-$700 Jake, especially if your lugging all your stuff. The truck/van will just guzzle gas.
I'm kinda in the same boat though, only instead I'll be going to LA instead of leaving. My crappy car won't make it out, so looking at selling it and just get something that will get me from A to B there. And just shipping my stuff; makes me glad I left my bf and left all my crap there. Good luck w/ your move though