Ist off, parts do wear out over time, so I wouldn't be worried "about future trips".
2nd, you say "horrific corrosion". My wife's Edge had an OEM Motorcraft battery that leaked under 4 years old, and we were the original owners of the vehicle. **** happens.
You don't mention year of vehicle or miles, but it really doesn't matter. Repairs will happen regardless of age or condition of the vehicle. Ironically, my mom has an 04' Taurus with only 45,000 miles on it, and her neutral safety switch caused the vehicle to not start over the weekend. She does short trips also, but again parts will fail and there really isn't anything you can do because preventitive maintenance only goes so far.
Edit: I just saw your user name, and don't tell me that you have a 93' Ranger because if so, it is 20 years old and you are complaining about parts going bad? Wait till you have a 4 or 5 year old vehicle that you are still making payments on, and you have to do repairs. I've already needed brakes, a new battery, and 4 new tires, but I also have almost 69,000 miles.