What to replace??

[Oobray]

Well other than this odd squeak I mentioned in another thread, the truck is running great. So I wondered what I can be replacing as a preventative measure. I want this to be a reliable tow rig for cross country trips with the family and anything I can do to reduce the risk of being stranded I'd like to do now in the comfort of my driveway. Is it worth replacing the fuel pump? Other than a slight whine when it's really cold it's not showing any signs of problems. What else should I replace? Like I said. I'd rather replace items known to fail before they fail. I don't drive the truck daily. Only on weekends or on trips. So when it fails it's likely to be a really bad time. The track has 189k on it and I've owned it for a year and only 3k.