In a few weeks, I'm going to have to do my first desert drive from Los Angeles to Phoenix. It's been a while since I've brought my car in for a rune-up and I've been reading through auto maintenance tips with a bit of nervousness. I don't take my car in regularly. My car's not acting funny or anything but, generally speaking, what's the most important maintenance to do before a lengthy desert drive? I know I need to bring a jug or two of water in case I break down, wheel tread seems okay (one wheel in the back is a bit bald), I'm not due for an oil change.