Then either learn to like drive-thru potatoes and salads or track down the trail mix in the grocery store and buy five pounds at a time. It keeps and you'll need it at some point. Finally, once a day, sit down and eat something real somewhere, at a table, without an engine rumbling underneath you. When you're on the road with four or five other guys all the time, a proper vehicle stereo is not a luxury item. Do not assume you will pass the time listening to the radio.
Radio is a nice idea gone horribly, horribly wrong.
Someone in the vehicle will be sick of whatever you find in an endless quest up and down the dial of dreck, so don't even bother trying. It's much better to slam Beggar's Banquet in the dash, crank it up, and, if anyone objects, throw them out of the band immediately. You will get ripped off eventually, and that's when you'll learn to stop bringing precious possessions from home with you. Like, for instance, your entire CD collection. When, as a young man, I first played clubs in the seedier underbellies of this great nation, we occasionally opened up a bedsheet, tossed everything into it, tied up the corners, and took it all inside the club with us.