Salt needs moisture to keep working on steel. Along the lake there is more of it, for more of the year, and the temperature swings that come off the water mean condensation forms on cold metal well outside winter. A car in Cudahy is not getting more salt than one in Franklin - it is staying wet for longer after it gets it, and that is what actually matters.
Practically, that shows up as brake and fuel lines going first, then exhaust, then suspension mounts and rocker seams. It is predictable, which is precisely why it is worth inspecting on a schedule instead of waiting for it.
An undercarriage inspection every spring, once the salt is off the roads. Undercar washes through the winter, particularly during thaws when everything is wet anyway. Brake lines inspected properly with any brake work, not glanced at.
None of it is expensive. All of it is dramatically cheaper than the failures it prevents, and it is the difference between a fifteen-year-old car that is still safe and one that quietly stopped being safe some time around year eleven.
$79 flat call-out, diagnostic included, 7 days a week, 7am - 7pm. If you decline the repair that is the whole bill.