Provigil will keep you awake nicely.
Fuck the audiobooks. By the fourth hour you will be so damn tired of hearing that voice droning on nonstop like a nagging ex wife you will ride in silence just out of spite.
Texas = forever. Expect the interstate ads to be mostly 1) Knives 2) Titty Bars 3) Free 88oz Steak (but only if you eat the entire thing, along with soup, salad, rolls, two veggie sides and dessert. Otherwise it is going to cost you $105.)
So you make sure you stop to buy yourself a decent knife (1) before going to the titty bar (2) and eating the free steak (3). Giving you a dull knife is one of the tricks they use to make sure you don't eat it all. You saw away at it as it cools to the point you end up with carpal tunnel syndrome.