Just POR15 the frame every few years.
![Grin ;D](https://www.autos.ca/forum/Smileys/CarTalk/grin.gif)
Not everyone wants to deal with constant maintenance of older vehicles though. Suspension components, steering components, exhaust systems, failed electronics, etc. To some people, $1,000 a month to make sure their vehicle doesn't strand their family on the QE2 when it's -30 out is worth it.